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Table of Contents 
REVIEW ARTICLE
Year : 2015  |  Volume : 60  |  Issue : 3  |  Page : 222-229
Oral lichen planus: An update on etiology, pathogenesis, clinical presentation, diagnosis and management


1 Department of Oral Pathology, Swami Devi Dyal Hospital and Dental College, Golpura, Barwala, Punjab, India
2 Laxmibai Institute of Dental Sciences and Hospital, Patiala, Punjab, India

Date of Web Publication6-May-2015

Correspondence Address:
Sonia Gupta
#95/3, Adarsh Nagar, Dera Bassi, Mohali, Punjab 140507
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0019-5154.156315

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   Abstract 

The mouth is a mirror of health or disease, a sentinel or early warning system. The oral cavity might well be thought as a window to the body because oral manifestations accompany many systemic diseases. In many instances, oral involvement precedes the appearance of other symptoms or lesions at other locations. Oral lichen planus (OLP) is a chronic mucocutaneous disorder of stratified squamous epithelium of uncertain etiology that affects oral and genital mucous membranes, skin, nails, and scalp. LP is estimated to affect 0.5% to 2.0% of the general population. This disease has most often been reported in middle-aged patients with 30-60 years of age and is more common in females than in males. The disease seems to be mediated by an antigen-specific mechanism, activating cytotoxic T cells, and non-specific mechanisms like mast cell degranulation and matrix metalloproteinase activation. A proper understanding of the pathogenesis, clinical presentation, diagnosis of the disease becomes important for providing the right treatment. This article discusses the prevalence, etiology, clinical features, oral manifestations, diagnosis, complications and treatment of oral LP.


Keywords: Degranulation, mucocutaneous, oral lichen planus, pathogenesis, stratified squamous


How to cite this article:
Gupta S, Jawanda MK. Oral lichen planus: An update on etiology, pathogenesis, clinical presentation, diagnosis and management. Indian J Dermatol 2015;60:222-9

How to cite this URL:
Gupta S, Jawanda MK. Oral lichen planus: An update on etiology, pathogenesis, clinical presentation, diagnosis and management. Indian J Dermatol [serial online] 2015 [cited 2018 Dec 11];60:222-9. Available from: http://www.e-ijd.org/text.asp?2015/60/3/222/156315

What was known?
Lichen planus is one of mucocutaneous disorder in which oral involvement precedes the appearance of other symptoms or lesions at other locations. Etiology of lichen planus as such is not known clearly, but at present it has been linked to autoimmune disorder For a general practitioner it is very important to know the important clinical features, diagnosis and treatment plan for this disease to differentiate it from other lesions. Now a days novel drug therapy and use of custom trays are of special concern for a dentist in management of oral lichen planus lesions.



   Introduction Top


The mouth is a mirror of health or disease, a sentinel or early warning system. The oral cavity might well be thought as a window to the body because oral manifestations accompany many systemic diseases. In many instances, oral involvement precedes the appearance of other symptoms or lesions at other locations. [1] Most of the oral mucosa is derived embryologically from an invagination of the ectoderm and perhaps not surprisingly, this, like other similar orifices, may become involved in disorders that are primarily associated with the skin.

Lichen planus (LP) is a chronic mucocutaneous disorder of the stratified squamous epithelium that affects oral and genital mucous membranes, skin, nails, and scalp. [2] Oral lichen planus (OLP) is the mucosal counterpart of cutaneous LP. [3] It is derived from the Greek word "leichen0" means tree moss and Latin word "planus" means flat. [4]


   Historical Background Top


The designation and description of the pathology were first presented by the English physician Erasmus Wilson in 1866. [5] He considered this to be the same disease as "lichen ruber," previously described by Hebra [6] and characterized the disease as "an eruption of pimples remarkable for their color, their figure, their structure, their habits of isolated and aggregated development." [7] In 1892, Kaposi reported the first clinical variant of the disease, lichen ruber pemphigoides. [8] In 1895, Wickham noted the characteristic reticulate white lines on the surface of LP papules, today recognized as Wickham striae. [9] Darier is credited with the first formal description of the histopathological changes associated with LP. [10]


   Epidemiology Top


The exact incidence and prevalence of LP is unknown. In 1895, Kaposi noted the disease as "rather frequent" with 25 to 30 cases presenting annually. [11] In the United States, the incidence of LP is reported to be approximately 1% of all new patients seen at health care clinics. [12] The Indian subcontinent has a particularly high incidence of disease. [13] LP is estimated to affect 0.5% to 2.0% of the general population, [14] the prevalence being ranging from 0.5% selectively in Japanese population, 1.9% in Swedish population, 2.6% in Indian population and 0.38% in Malaysia (relatively uncommon). [15] The relative risk is 3.7% in people with mixed oral habits, lowest (0.3%) in non-users of tobacco and highest (13.7%) among those who smoked and chewed tobacco. [16] This disease has most often been reported in middle-aged patients with 30-60 years of age and is more common in females than in males. OLP is also seen in children, although it is rare. [17] It affects all racial groups . [18] However, according to some literature white individuals are five and a half time more likely to develop this disease compared to other races. [19] OLP occurs more frequently than the cutaneous form and tends to be more persistent and more resistant to treatment. [20]


   Etiology Top


Although the exact etiology of this disease is still unknown, but some factors are associated with it. These are as follows:

Genetic background

Familial cases are rare. An association has been observed with HLA-A3, A11, A26, A28, B3, B5, B7, B8, DR1, and DRW9 . [21],[22],[23],[24] In Chinese patients, an increase in HLA-DR9 and Te 22 antigens has also been noted. [25]

Dental materials

A great many materials commonly used in restoration treatments in the oral cavity have been identified as triggering elements for OLP, including silver amalgam, gold, cobalt, palladium, chromium and even non-metals such as epoxy resins (composite) and prolonged use of denture wear. [26],[27],[28],[29]

Drugs

Oral lichenoid drug reactions may be triggered by systemic drugs including NSAIDs, beta blockers, sulfonylureas, some angiotensin-converting enzyme (ACE) inhibitors, and some antimalarials, contact allergens including toothpaste flavorings, especially cinnamates. [26],[30]

Infectious agents

OLP has been suggested to be related to bacteria such as a Gram-negative anaerobic bacillus and spirochetes but this has not been confirmed. [28] Some of the studies reveal the role of Helicobacter pylori (HP) in the etiology of OLP. [31],[32] However, no evidence of its role has been detected in OLP in some recent studies. [33] Recently, it has been found in some literature that few periodontopathogenic microorganisms are also associated with the patients of OLP. [34] Role of candida infection is controversial in OLP. Several studies have shown an increased prevalence of candida species. [28] However, some studies reveal that there is an insignificant association between candida infection and OLP. [35],[36] OLP has been found to be associated with various viral agents such as human papilloma virus (HPV), [37],[38],[39],[40] Epstein Barr virus (EBV), [41] human herpes virus 6 (HHV-6) [39] and human immunodeficiency virus (HIV). [42] Epidemiological evidences from various studies worldwide strongly suggest that hepatitis C virus (HCV) may be an etiologic factor in OLP. [43],[44] In OLP, HCV replication has been reported in the epithelial cells from mucosa of LP lesions by reverse transcription/polymerase chain reaction or in-situ hybridization; also, HCV-specific CD4 and CD8 lymphocytes were reported in the subepithelial band. These probably suggest that HCV-specific T lymphocytes may play a role in the pathogenesis of OLP. The putative pathogenetic link between OLP and HCV still remains controversial and needs a lot of prospective and interventional studies for a better understanding. [45]

Autoimmunity

OLP may occasionally be associated with autoimmune disorders such as primary biliary cirrhosis, chronic active hepatitis, ulcerative colitis, myasthenia gravis, and thymoma. [46]

Bowel disease

Bowel diseases occasionally described concomitant with OLP include coeliac disease, ulcerative colitis and Crohn's disease. [47]

Food allergies

Food and some of food additives such as cinnamon aldehyde have been found to be associated with OLP. [28]

Stress

One of the factors responsible for the development of OLP is anxiety and stress. Some of the studies in literature reveal the role of the psychological stress in the etiology of OLP. [48],[49],[50]

Habits

Although most patients with OLP show no increased prevalence of cigarette smoking, [51] it has been suggested to be an etiological factor in some Indian communities. [52] Betel nut chewing is also more prevalent in Indian patients with OLP than in those without. [53],[54],[55]

Trauma

Trauma as such has not been quoted as an etiological factor in LP, although it may be the mechanism by which other etiological factors exert their effects. [28]

Diabetes and hypertension

Studies have revealed that both diabetes mellitus (DM) and high blood pressure are associated with OLP. [56],[57],[58],[59]

(Greenspan syndrome: Triad of DM, hypertension and OLP)

Malignant neoplasms

LP has been observed on the skin and/or mucosae of patients affected by a range of different neoplasms such as with breast cancer and metastatic adenocarcinoma. [28]

Miscellaneous associations

OLP has occasionally been associated with other conditions, including psoriasis, lichen sclerosis, urolithiasis, agents used to treat gall stones, Turner's syndrome, etc. [28]


   Pathogenesis Top


OLP is a T-cell mediated autoimmune disease in which the auto-cytotoxic CD8 + T cells trigger apoptosis of the basal cells of the oral epithelium. [60]

An early event in the disease mechanism involves keratinocyte antigen expression or unmasking of an antigen that may be a self-peptide or a heat shock protein. [61] Following this, T cells (mostly CD8+, and some CD4 + cells) migrate into the epithelium either due to random encounter of antigen during routine surveillance or a chemokine-mediated migration toward basal keratinocytes. These migrated CD8 + cells are activated directly by an antigen binding to major histocompatibility complex (MHC)-1 on keratinocyte or through activated CD4 + lymphocytes. In addition, the number of Langerhans cells in OLP lesions is increased along with upregulation of MHC-II expression; subsequent antigen presentation to CD4 + cells and interleukin (IL)-12 activates CD4 + T helper cells which activate CD8 + T cells through receptor interaction, interferon γ (INF-γ) and IL-2. The activated CD8 + T cells in turn kill the basal keratinocytes through tumor necrosis factor (TNF)-α, Fas-FasL-mediated or granzyme B-activated apoptosis. [62]


   A Cytokine-Mediated Lymphocyte Homing Mechanism Top


In OLP, there is increased expression of the vascular adhesion molecules (VAM), that is, CD62E, CD54, and CD106, by the endothelial cells of the sub-epithelial vascular plexus. The infiltrating lymphocytes express reciprocal receptors (CD11a) to these VAM. Some of the cytokines that are responsible for the upregulation of the VAM are: TNF-α, IFN-γ and IL-1. [63]

Nonspecific mechanisms like mast cell degranulation and MMP-1 activation further aggravate the T-cell accumulation, BM disruption by mast cell proteases and keratinocyte apoptosis. [64] The normal integrity of the BM is maintained by a living basal keratinocyte due to its secretion of collagen 4 and laminin 5 into the epithelial BM zone. In turn, keratinocytes require a BM-derived cell survival signal to prevent the onset of its apoptosis. Apoptotic keratinocytes are no longer able to perform this function, which results in disruption of the BM. Again, a non-intact BM cannot send a cell survival signal. This sets in a vicious cycle which relates to the chronic nature of the disease. [65]

The matrix metalloproteinase (MMP) are principally involved in tissue matrix protein degradation. MMP-9, which cleaves collagen 4, along with its activators is upregulated in OLP lesional T cells, resulting in increased BM disruption. [66]

RANTES (Regulated on Activation, Normal T-cell Expressed and Secreted) is a member of the CC chemokine family which plays a critical role in the recruitment of lymphocytes and mast cells in OLP. The recruited mast cell undergoes degranulation under the influence of RANTES, which releases chymase and TNF-α. These substances upregulate RANTES secretion by OLP lesional T cells. [67]

Weak expression of transforming growth factor (TGF)-β1 has been found in OLP. TGF-β1 deficiency may predispose to autoimmune lymphocytic inflammation. The balance between TGF-β1 and IFN-γ determines the level of immunological activity in OLP lesions. Local overproduction of IFN-γ by CD4 + T cells in OLP lesions downregulates the immunosuppressive effect of TGF-β1 and upregulates keratinocyte MHC class II expression and CD8 + cytotoxic T-cell activity. [68]


   Clinical Features Top


The cutaneous lesions of LP are characterized by 5 ps: Purple, polygonal, pruritic papules and plaque. [14] Initially, LP is evident as a cutaneous and mucosal eruption, though rarely it can manifest with only oral or nail findings. LP usually begins as discrete, flat-topped papules that are 3 to 15 mm in diameter which may coalesce into larger plaques. Early in course of the disease they appear red, but soon they take on reddish purple or violaceous hue. The center of the papule may be slightly umblicated and its surface is covered by characteristic, very fine grayish white lines, called Wickham striae. The lesions can occur anywhere on the skin surface but often are located on the flexor surfaces of limbs, inner aspects of knees and thighs and trunk and also may appear on lines of trauma, reflecting the Köbner phenomenon. [7] The face frequently remains uninvolved. The primary symptom of LP is severe pruritis. The severity of pruritus varies. [16] Some patients report genital involvement with features similar to skin lesions. [69] scalp involvement (lichen planopilaris), and nail beds. [14] Rarely, there is laryngeal, esophageal and conjunctival involvement. [62]


   Oral Manifestations Top


In the oral cavity, the disease assumes somewhat different clinical appearance than on the skin, and is characterized by lesions consisting of radiating white, gray, velvety, thread-like papules in a linear, annular and retiform arrangement forming typical lacy, reticular patches, rings and streakes. A tiny white elevated dot is present at the intersection of white lines known here as striae of Wickham as compared to Wickham striae in skin. [16] The lesions are asymptomatic, bilaterally/symmetrically anywhere in the oral cavity, [70] but most common on buccal mucosa, tongue, lips, gingiva, floor of mouth, palate and may appear weeks or months before the appearance of cutaneous lesions.

OLP has six classical clinical presentations [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6] described in the literature: [2]

  • Reticular
  • Erosive
  • Atrophic
  • Plaque-like
  • Papular
  • Bullous.


Reticular
Figure 1: Reticular type lichen planus on the lips and mucosa of the cheek

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Figure 2: Erosive type lichen planus ulcerated lesion in the buccal mucosa with erythematous borders


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Figure 3: Atrophic type lichen planus sometimes representing as desquamative gingivitis

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Figure 4: Plaque type lichen planus lesion on tongue

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Figure 5: Papular type lichen planus lateral border of tongue

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Figure 6: Bullous type lichen planus lesion on upper buccal mucosa

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It is the most common clinical form of this disease and presents with fi ne, asymptomatic intertwined lace-like pattern called "Wickham striae" in a bilateral symmetrical form and involves the posterior mucosa of the cheek in most cases.

Erosive

This is the most significant form of the disease because it shows symptomatic lesions often surrounded by fine radiant keratinized striae with a network appearance. [20]

Atrophic

It exhibits diffuse red lesions and it may resemble the combination of two clinical forms, such as the presence of white striae characteristic of the reticular type surrounded by an erythematous area. [2]

Plaque-like

This type shows whitish homogeneous irregularities similar to leukoplakia; it mainly involves the dorsum of the tongue and the mucosa of the cheek. [2]

Papular

This form is rarely observed and is normally followed by some other type of variant described. It presents with small white papules with fine striae in its periphery. [2]

Bullous

It is the most unusual clinical form, exhibiting blisters that increase in size and tend to rupture, leaving the surface ulcerated and painful. Nikolsky's sign may be positive.


   Gingival Involvement Top


The gingival lesions in LP fall into one or more of the following categories [Figure 2]: [2]

Keratotic lesions are usually present on the attached gingiva as small raised round white papules of pinhead size with a flattened surface.

Vesiculo-bullous lesions are other mucocutaneous disorders especially pemphigoid, dermatitis herpetiformis, or linear IgA disease. [71]

Atrophic and Erosive: Produce the desquamative gingivitis.

The triad constituted by desquamative or erosive LP involving the vulva, vagina and gingiva is termed as vulvovaginal-gingival syndrome. [72]


   Diagnosis Top


The history, typical oral lesions and skin or nail involvement are usually sufficient to make a clinical diagnosis of OLP. However, a biopsy is the recommended procedure to differentiate it from other lesions.


   Histopathology Top


The classic histopathologic features of OLP include liquefactive degeneration of the basal cell accompanied by apoptosis of the keratinocytes, a dense band-like lymphocytic infiltrate [Figure 7] at the interface between the epithelium and the connective tissue, focal areas of hyperkeratinized epithelium (which give rise to the clinically apparent Wickham's striae) and occasional areas of atrophic epithelium where the rete pegs may be shortened and pointed (a characteristic known as saw tooth rete pegs). Eosinophilic colloid bodies (Civatte bodies), which represent degenerating keratinocytes, are often visible in the lower half of the surface epithelium. [14] Degeneration of the basal keratinocytes and disruption of the anchoring elements of the epithelial BM and basal keratinocytes (e.g. hemi desmosomes, filaments, fibrils) weaken the epithelial connective tissue interface. As a result, histologic clefts (Max-Joseph spaces) may form and blisters on the oral mucosa (bullous LP) may be seen at clinical examination. B cells and plasma cells are uncommon findings. [18]
Figure 7: Histology of oral lichen planus

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   Direct Immunofluorescence Top


Immunoglobulin or complement deposits are not a consistent feature of OLP. In some instances, fibrinogen and fibrin are deposited in a linear pattern in the BM zone. Colloid bodies contain fibrin, IgM, C3, C4, and keratin. Laminin and fibronectin staining may be absent in areas of heavy fibrin deposition and colloid body formation. This finding suggests BM damage in these areas. In OLP, electron microscopy (EM) is used principally as a research tool. The ultrastructure of the colloid bodies suggests that they are apoptotic keratinocytes, and recent studies using the end labeling method revealed DNA fragmentation in these cells. EM shows breaks, branches, and duplications of the epithelial BM in OLP. [18]


   Serology Top


There are no consistent serological changes associated with OLP but some patients do present an elevated antinuclear antibody (ANA) titer.


   Hematological Investigations Top


Blood biochemistry and full blood examination (FBE) should also be included in the full patient workup.


   Cytology Top


Although cytological changes may be detected in OLP, the use of exfoliative cytology is not recommended. [62] Some studies show an increased incidence of C. albicans infection in patients with OLP. Periodic acid-Schiff (PAS) staining of biopsy specimens and candidal cultures or smears may be performed. [18]


   Differential Diagnosis Top


The differential diagnosis can include cheek chewing/frictional keratosis, leukoplakia, lichenoid reactions, leukoplakia, lupus erythematous, pemphigus, mucus membrane pemphigoid, para neoplastic pemphigus, erythematous candidiasis and chronic ulcerative stomatitis, Graft vs. host disease. [3]


   Malignant Potential of OLP Top


Malignant transformation of OLP remains a very controversial issue. [62] At least some reported cases diagnosed originally as OLP on clinical and/or histological grounds were probably epithelial dysplasia (lichenoid dysplasia) that progressed subsequently to overt squamous cell carcinoma (SCC). [73] The OLP lesions are consistently more persistent than the dermal lesions and have been reported to carry a risk of malignant transformation to oral squamous cell carcinoma (OSCC) of 1-2% (reported range of malignant transformation 0- 12.5%). [74] Erythroplastic lesions may also occur in OLP. They develop in approximately 1% of the patients and are sharp with slight reddish depressions. [2] In most cases, malignant transformation to carcinoma in situ (28.5%) and in micro invasive carcinoma (30-38%) is observed, less frequently stage I and II carcinoma. Oral cancer-correlated OLP predisposes to the development of multiple primary metachronous tumors of the oral cavity and of lymph node metastases.[75],[76]


   Management Top


The principal aims of current OLP therapy are the resolution of painful symptoms, oral mucosal lesions, the reduction of the risk of oral cancer, and the maintenance of good oral hygiene. Eliminate the local exacerbating factors as preventive measures. Up to now different therapies are described for OLP including drug therapy, surgery, psoralen with ultraviolet light A (PUVA), and laser. Use of novel drug therapy is the most common method for treatment of OLP. Different drugs have been used in the form of topical and systemic application for the treatment of OLP. [77] Drugs used in topical form are corticosteroids, immunosuppressives, retinoids, and immunomodulators. Drugs which are used systemically are thalidomide, metronidazole, griseofulvin, and hydroxychloroquine, some retinoids and corticosteroids. Small and accessible erosive lesions located on the gingiva and palate can be treated by the use of an adherent paste in the form of a custom tray, which allows for accurate control over the contact time and ensures that the entire lesional surface is exposed to the drugs. [3]

Local drug delivery can provide a more targeted and efficient drug-delivery option than systemic delivery for diseases of the oral mucosa. The main advantages of local drug delivery include (i) reduced systemic side effects, (ii) more efficient delivery as a smaller amount of drug is wasted or lost elsewhere in the body, and (iii) targeted delivery as drugs can be targeted to the diseased site more easily when delivered locally, thereby reducing side effects. [78] However, potential for novel drug delivery systems in dentistry has not yet been fully realized and further research is still needed in order to improve treatment outcomes.

Surgical excision, cryotherapy, CO 2 laser, and ND:YAG laser have all been used in the treatment of OLP. In general, surgery is reserved to remove high-risk dysplastic areas.

Photo chemotherapy, a new method in which clinician uses ultraviolet A (UVA) with wavelengths ranging from the 320 to 400 nm, after the injection of psoralen is also used. Relaxation, meditation and hypnosis have positive impact on many cutaneous diseases and help to calm and rebalance the inflammatory response which can ameliorate inflammatory skin disorders.


   Conclusion Top


OLP is a very common oral dermatitis and is one of the most frequent mucosal pathoses encountered by dental practitioners. It is imperative that the lesion is identified precisely and proper treatment be administered at the earliest. A proper understanding of the pathogenesis, clinical presentation, diagnosis of the disease becomes important for providing the right treatment.

 
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What is new?
Lichen planus is one of mucocutaneous disorder in which oral involvement precedes the appearance of other symptoms or lesions at other locations. Etiology of lichen planus as such is not known clearly, but at present it has been linked to autoimmune disorder For a general practitioner it is very important to know the important clinical features, diagnosis and treatment plan for this disease to differentiate it from other lesions. Now a days novel drug therapy and use of custom trays are of special concern for a dentist in management of oral lichen planus lesions.


    Figures

  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7]



 

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    Abstract
   Introduction
    Historical Backg...
   Epidemiology
   Etiology
   Pathogenesis
    A Cytokine-Media...
   Clinical Features
   Oral Manifestations
   Gingival Involvement
   Diagnosis
   Histopathology
    Direct Immunoflu...
   Serology
    Hematological In...
   Cytology
    Differential Dia...
    Malignant Potent...
   Management
   Conclusion
    References
    Article Figures

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