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CME ARTICLE
Year : 2016  |  Volume : 61  |  Issue : 3  |  Page : 241-250
Atopic dermatitis: Clinical connotations, especially a focus on concomitant atopic undertones in immunocompromised/susceptible genetic and metabolic disorders


1 Dermato Venereology (Skin/VD) Center, Sehgal Nursing Home, New Delhi, India
2 Department of Dermatology, Dr. RML Hospital, Postgraduate Institute of Medical Education and Research, New Delhi, India
3 Department of Dermatology and STD, Lady Hardinge Medical College, New Delhi, India
4 Skin Institute and School of Dermatology, New Delhi, India
5 Department of Dermatology, Bankura Sammilani Medical College, Bankura, West Bengal, India

Date of Web Publication13-May-2016

Correspondence Address:
Prof. Virendra N Sehgal
DermatoVenerology (Skin/VD) Center, Sehgal Nursing Home, A/6 Panchwati, New Delhi - 110 033
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0019-5154.182433

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   Abstract 

Atopic dermatitis (AD) is an intriguing clinical entity. Its clinical connotations are varied, the updates of which are required to be done periodically. An attempt to bring its various facets have been made highlighting its clinical features keeping in view the major and the minor criteria to facilitate the diagnosis, differential diagnosis, complications, and associated dermatoses. The benefit of the current dissertation may percolate to the trainees in dermatology, in addition to revelations that atopic undertones in genetic susceptibility and metabolic disorder may provide substantive insight for the future in the understanding of thus far enigmatic etiopathogenesis of AD.


Keywords: Atopic dermatitis, clinical connotation, genetic susceptibility, metabolic disorder


How to cite this article:
Sehgal VN, Khurana A, Mendiratta V, Saxena D, Srivastava G, Aggarwal AK, Chatterjee K. Atopic dermatitis: Clinical connotations, especially a focus on concomitant atopic undertones in immunocompromised/susceptible genetic and metabolic disorders. Indian J Dermatol 2016;61:241-50

How to cite this URL:
Sehgal VN, Khurana A, Mendiratta V, Saxena D, Srivastava G, Aggarwal AK, Chatterjee K. Atopic dermatitis: Clinical connotations, especially a focus on concomitant atopic undertones in immunocompromised/susceptible genetic and metabolic disorders. Indian J Dermatol [serial online] 2016 [cited 2021 Dec 1];61:241-50. Available from: https://www.e-ijd.org/text.asp?2016/61/3/241/182433

What was known?
Atopic dermatitis, a well-conceived age related entity pre-eminently identified through infantile, childhood and adult phases. Senile atopic dermatitis characterized by marked xerosis and conspicuous absence of lichenification.



   Introduction Top


Symptoms of atopic dermatitis (AD) usually start in infancy. Intense pruritus and cutaneous reactivity are its presenting features. It can present with three clinical patterns. Acute atopic eczema presents with a weeping, crusting papulovesicular eruption. Subacute AD presents with dry and scaly erythematous papules and plaques.[1] Features of lichenification and fibrotic papules may be apparent in chronic cases.[2],[3],[4],[5],[6] it is, therefore, interesting to dwell on concomitant atopic undertones in predisposed genetic and metabolic disorders, the salient glimpses of which are succinctly depicted. It may be enlightening for comprehending the etiopathogenesis [7],[8] of AD in perspective.


   Clinical Connotation Top


Age-related clinical features are fairly representative and assist in the diagnosis of AD, the outline of which is defined below:

Infantile phase

This phase refers to the disease in the first 2 years of life. Its onset is within the first 6 months. The lesions usually begin on the face and scalp [Figure 1],[Figure 2],[Figure 3]. They are symmetric and gradually spread to other parts, especially extensors of limbs as infants start to crawl. However, the distribution characteristics may vary. In an Indian study, 79% in the infantile AD group had facial involvement, 52.3% had extensor involvement, 42% had flexors affected, and 5.7% had both flexors and extensors affected.[9]
Figure 1: Atopic dermatitis: erythematous-squamous plaques over posterior aspect of thighs in a 3-year-old boy

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Figure 2: Atopic dermatitis: depicting erythemato-squamous plaque affecting the cheeks and forehead in a 1-year-old boy

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Figure 3: Atopic dermatitis: Erythematous, scaly and partially crusted papules and plaques in a 7-month-old infant

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Acute, oozing eczematous, crusting and impetiginization are also seen. It may run a chronic relapsing course.

Childhood phase

This phase starts from 2 to 12 years of age. Frequently, involved sites are flexures of the elbow/knee and wrist. Ankle and neck may also be affected [Figure 4]. Subacute to chronic lichenified dermatitis is frequent.[6]
Figure 4: Atopic dermatitis: Erythematous and scaly plaques over forehead and cheeks in a 2-year-old boy

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In the study quoted above, in the childhood group, 74.5% of children had facial involvement, 35.5% had flexures affected, 56.32% had extensor involvement, and 8.24% had both flexors and extensors affected.[8]

Adolescent phase

The disease course between 12 and 18 years is characterized by lichenified eczematous lesions, primarily affecting the flexures [Figure 5] and [Figure 6]. Classic eczematous and typical lichenoid may be seen in this age group.[10]
Figure 5: Atopic dermatitis: Scaly and lichenified plaques over thighs with extension to the popliteal fossae in a 4-year-old child

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Figure 6: Atopic dermatitis: Excoriated papules with lichenification in the popliteal fossa

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Adult type

After 18 years of age, lichenified lesions are more common, and can be seen especially on flexures and hands. Localized, isolated lesions can also be seen.[5]

Aforementioned phases of AD are succinctly displayed in [Table 1].
Table 1: Atopic dermatitis: Displaying age-related clinical connotations

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Localized variations, namely nipple eczema, eyelid eczema, cheiltis, vulval eczema, infra-auricular, and infra-nasal fissuring may also be seen in adults and adolescents. Morphological variants like follicular, pityriasis alba-like, papular – lichenoid, nummular/discoid, prurigo-like, dyshidrotic, and erythrodermic forms may be recognized in isolated cases.[4],[5] Hyper-linearity of palms and soles, Dennie–Morgan infraorbital fold, white dermographism, facial pallor, low hairline, and keratosis pilaris are a few other associations. Dermatitis of hands and feet is also commonly seen. In more severe cases, thick lichenified plaques are seen on the dorsal hands, feet, and knees. Children with darker skin typically have perifollicular hyperpigmented or hypopigmented rough 1–2-mm papules that can coalesce into broad, near-diffuse plaques, most prominent on the extensor surfaces.

Xerosis or icthyosis of the surrounding skin is common. Postinflammatory pigmentary changes (hyper/hypo) are also commonly seen at sites of previously healed lesions. Excoriations and erosions are nearly universal and are often the result of scratching or an indication of bacterial colonization.

Aggravation of dermatitis may occur with a variety of factors such as climate, sweating, intercurrent infections, irritants, food allergy, and psychosomatic undertones. Aero-allergens such as animal dander may also provoke an attack.[4], 5, [12],[13],[14]

While majority of the patients in one study had aggravation of their eczema in the winters (62%) as a result of decreased moisture in the climate, 17% had aggravation in the summers probably due to hyperhidrosis, itching and secondary skin infections [15] Similar was the findings of Dhar and Kanwar: 67.14% of infants had aggravation during winters, and 23.36% had aggravation during summers.[9] The corresponding figures in the childhood AD patients were 58% and 32.9%, respectively.[9] On the contrary, in the study by Dhar and Kanwar in different climatic conditions in Eastern India, 40% patients had aggravation during summers, and only 15% had winter exacerbation.[16]


   Complications Top


Respiratory allergy

Several studies have evaluated the association between AD and respiratory allergy, Kulig et al .[17] have shown that, at the age of 5 years, 50% of children with AD have developed allergic respiratory diseases. van der Hulst et al .[18] in their systematic review have confirmed that young children with AD had a high risk of developing asthma in later childhood. According to a recent study by Spergel,[19] more than 50% of children with AD may develop asthma and approximately 75% allergic rhinitis during the first 6 years of life.

Retarded growth

Even before the advent of effective corticosteroid therapy, a retarded growth was reported,[20] which may, in present times, be exacerbated by treatment with oral and/or topical steroids.

A longitudinal study [21] to look for the effect of AD on growth was carried out. The growth patterns of 62 children aged 3–5 years, suffering from AD were studied in terms of body weight, height, and head circumference. Sixty-eight normal healthy children matched for age, sex, and socioeconomic status were taken as controls. The growth velocities were lower in patients with AD than in controls. The mean values for height and head circumference were found to be significantly lower in girls than in the girls of the control group whereas, in boys, these values for the patients remained comparable or higher than in the boys of the control group at some of the ages. Growth retardation was observed among children with a more severe form of the disease. Height of the affected children was mostly compromised.

Bacterial infections

Secondary bacterial infections by Streptococcus or Staphylococcus have often been encountered in the patients, especially those on topical and/or oral corticosteroids.[20] Secondarily infected AD presents with pustules and crusting. It should be suspected when lesions do not respond to conventional treatment or if fever and malaise are present alongside.[1]

Viral infections

Both in active and quiescent stages, these patients can develop acute generalized herpes simplex (eczema herpeticum), and vaccinia (eczema vaccinatum). Acquired immunodeficiency syndrome may aggravate the condition.[20]

Ocular abnormalities

Apart from Dennie–Morgan fold, eyes reveal conjunctival inflammation and keratoconjunctivitis. Keratoconus may be an infrequent accompaniment. Cataract may occur in up to 10% of severe adolescent/adult cases.[20]

A recent study [22] has investigated ocular abnormalities in 100 Indian patients, in the age group of 1–14 years, and reported ocular changes in the form of lid and conjunctival involvement in 43%. The conjunctival changes were mostly “cobblestone” appearance of the papillae, with papillary reaction, and papillary hypertrophy whereas the lid showed isolated blepharitis, and loss of the eyelashes, and eczema of the eyelids. These changes had a male preponderance, and family history of atopy was seen to be a significant indicator for ocular changes.

Psychosocial aspects

The quality of life of the patient as well as of the family is often profoundly disturbed, which may lead to various grades of behavioral difficulties.[20]

Erythroderma/Generalised Exfoliative Dermatitis

Although erythroderma [Figure 7] rare, it may occur due to superinfection, and occasionally due to the withdrawal of systemic corticosteroids.[20]
Figure 7: Atopic dermatitis: Erythoderma depicted dry red and scaly skin

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   Diagnosis: Changing Scenario Top


Hanifin and Rajka [4] pioneered a systematic approach towards the standardization of the diagnosis of AD and proposed four major and 23 minor criteria, of which presence of three major and three minor criteria could be diagnostic [Table 2]. Despite a certain reservation, these criteria have remained a gold standard in research and academic teaching. The UK Working Party [23] criteria [Table 3] provides a validated instrument for epidemiologic studies. De et al . found statistical advantage in favor of Hanifin and Rajka's criteria (sensitivity, 96.4%; specificity, 93.75%) compared with the UK Working Party's diagnostic criteria (sensitivity, 86.14%; specificity 95.83%).[23]
Table 2: Atopic dermatitis: Hanifin and Rajka[3] criteria

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Table 3: Atopic dermatitis: UK Working Party criteria[23]

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Williams et al .[14] coordinated a UK Working Party to attempt to refine the criteria of Hanifin and Rajka into a repeatable and validated set of diagnostic criteria for AD which is shown in [Table 3].

A consensus conference on pediatric AD spearheaded by the American Academy of Dermatology [24] had suggested a revised Hanifin and Rajka [4] criteria [Table 4] that are more streamlined and additionally applicable to the full range of ages affected. While this set has not been assessed in validation studies, it is felt by the current work group that an adaptation of this pragmatic approach for diagnosing AD in infants, children, and adults is well suited for use in the clinical setting.
Table 4: Atopic dermatitis: consensus conference on pediatric atopic dermatitis spearheaded by the American Academy of Dermatology[24]

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Laboratory studies [25] are rarely required to confirm the diagnosis of AD, which is primarily based on clinical features. Estimation of serum immunoglobulin E (IgE), prick tests, radioallergosorbent test (RASTS) may be undertaken which paradoxically can be negative in up to one fourth of atopics and may be positive in 15% of normal individuals.


   Histopathology Top


In early phases, there is mild spongiosis, exocytosis of lymphocytes, and parakeratosis. Lymphocytes and scattered histiocytes are present around the superficial vascular plexus.

In long-standing lesions, the rete ridges are regularly elongated, with less prominent spongiosis and cellular infiltrate. Hyperkeratosis and wedge-shaped hypergranulosis with areas of parakeratosis develop. There appear to be an increased number of small vessels with thickened walls. Eosinophils are less conspicuous than in allergic contact or nummular dermatitis.[25],[26]


   Differential Diagnosis Top


Several other conditions may stimulate AD. In an infant seborrheic dermatitis is the most common of these. Occasionally, it may be difficult to differentiate between these two, because of some overlapping features shared by them. Pruritus, age at onset and a family history of atopy cannot reliably discriminate between these two entities. Lesions over the forearms and shins and specific serum IgE to egg white and milk favor the diagnosis of AD. In the case of infantile seborrheic dermatitis, the lesions are often found in the seborrheic sites on the face, neck folds, axillae and/or the groin folds.[27]

Scabies in babies often undergoes eczematization, particularly over the face, quite closely simulating AD. A history of acute itching among the family contacts, the presence of burrows and inflammed papules and nodules over the genital and axillary areas support a diagnosis of scabies with eczematization.[28]

Other conditions which need to be considered are contact dermatitis, dermatitis herpetiformis, impetigo, lichen simplex chronicus, nummular eczema, and psoriasis.[29]

There are a number of genetic and metabolic disorders [Table 5][25] wherein an eruption resembling AD may develop (with or without other atopic disorders) or which are associated with a raised IgE level. Many such conditions are immuno-compromised states.[30] Thus, these conditions are to be suspected when a patient is having eczema-like AD, but is not responding to conventional treatment. It may also be a plausible facet to define its etiopathogenesis.[7]
Table 5: Concomitant atopic undertones in genetic susceptibility and metabolic disorders

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Associated dermatoses

A variety of dermatoses is associated, and may lead to increased severity of AD through exacerbations and stress. Infections, such as bacterial, fungal, and viral, are frequent and often become recurrent and chronic. Others such as alopecia areata, drug reactions, and pigmentary disorders [26] are often encountered.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.[50]

[Additional file 1]

 
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What is new?
In addition to changing scenario of atopic dermatitis, a focus on concomitant atopic undertones in Immuno-compromised/susceptible genetic and metabolic disorders is formed to enlighten the audience in furthering their role in comprehension of its etio-pathogenesis.


    Figures

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

  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5]

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