Indian Journal of Dermatology
: 2013  |  Volume : 58  |  Issue : 5  |  Page : 409-

An unusual presentation of sporotrichosis

SS Vaishampayan, Priyanka Borde 
 Department of Dermatology, Base Hospital, Delhi Cantt, New Delhi, India

Correspondence Address:
Priyanka Borde
Department of Dermatology, Base Hospital, Delhi Cantt, New Delhi - 110 010


Sporotrichosis can mimic a few diseases. Sporotrichosis presenting as a hypoaesthetic plaque or plaque suggestive of leprosy has not been mentioned in literature. Herein we present a case of a 26 years old man who presented with hypoesthetic plaque on left ankle and was clinically diagnosed to have borderline tuberculoid leprosy who later developed few nodules in linear fashion on left leg, which ruptured to form non healing ulcers. Culture from ulcer grew Sporothrix schenckii. Patient was successfully treated with oral potassium iodide.

How to cite this article:
Vaishampayan S S, Borde P. An unusual presentation of sporotrichosis.Indian J Dermatol 2013;58:409-409

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Vaishampayan S S, Borde P. An unusual presentation of sporotrichosis. Indian J Dermatol [serial online] 2013 [cited 2020 Aug 10 ];58:409-409
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Sporotrichosis usually presents as multiple nodules in linear fashion. It may show fixed plaque like lesions which may ulcerate. [1] Leprosy is a disease having variable presentations like hypopigmented, hypoaesthetic plaques to nodules of Hansen's disease (LL) and erythematous tender nodules of erythema nodosum leprosum (ENL). Few case reports have shown occurrence of nodular lesions in sporotrichoid fashion either in a case of lepromatous leprosy or as nerve abscesses in upgrading reaction of borderline tuberculoid (BT) leprosy. [2],[3],[4] Sporotrichosis presenting as a hypoaesthetic plaque resembling leprosy is not mentioned in literature. Our patient presented with single hypoesthetic plaque on left ankle which appeared like plaque of BT leprosy. In a period of one and half months, he developed few linear nodules starting few cm away existing plaque. Culture and histopathology from nodular lesions showed evidence of sporotrichosis.

 Case History

A 26-years-old male, resident of Kolhapur, Maharashtra, presented with a hypoaesthetic plaque on the posterior aspect of left ankle of 6 months duration. There was no history of penetrating trauma/similar lesions anywhere else on the body. There was no history of oedema/constitutional symptoms/pain in the limbs/motor weakness/deformity i.e., there was no evidence of lepra reaction.

For these complaints patient had shown to a dermatologist. Patient was diagnosed clinically as a case of Hansen's disease and started on anti-leprosy treatment, without undergoing skin biopsy and slit skin smear examination.

General and systemic examination was unremarkable. Dermatological examination revealed a single, well defined hyperpigmented annular plaque of size 8 × 6 cm in size, which was dry, hypoesthetic [Figure 1]. There was no nerve thickening close to the patch. There was no significant peripheral nerve thickening. No motor deficit or deformity was noticed. Haematological and biochemical investigations did not reveal any abnormality. Slit skin smear did not show lepra bacilli. Skin biopsy showed thickening of epidermis, periappendageal lymphocytic infiltration. No perineural infiltration/granuloma/lepra bacilli were seen.{Figure 1}

Though histopathology was not confirmatory of Hansen's disease, but the presence of a classical borderline tuberculoid like plaque inclined us to continue anti-leprosy treatment, considering Hansen's disease to be one of the commonest causes of hypoaesthesia. The differential diagnoses of lupus vulgaris and annular sarcoidosis were considered but histopathology was non confirmatory and other supportive investigations like chest X-ray, serum Angiotensin converting enzyme levels, serum Elisa test for Mycobacterium tuberculosis did not reveal any abnormality. Two weeks later, patient developed a painful nodule, few cm away from the existing plaque. It resembled a furuncle and patient was started on oral and topical antibiotics. The nodule did not regress in size and ultimately ruptured to form an ulcer. The ulcer had well defined, hyperpigmented margins, sloping edges, with pale granulation tissue and yellowish necrotic slough on the floor. Pus from ulcer was sent for culture and sensitivity and patient was started on appropriate oral antibiotics. However the ulcer did not heal. In next three weeks, patient developed three more such nodules in linear fashion which ruptured to form non healing ulcers [Figure 2].{Figure 2}

We considered differential diagnoses of sporotrichosis and atypical mycobacterial infection. Histopathology from ulcer tissue showed granuloma formation [Figure 3] with multiple neutrophilic microabscesses and eosinophils [Figure 4]. Cigar shaped fungal element were detected on periodic acid schiff (PAS) stain [Figure 5]. Pus culture from ulcer showed growth of Staphylococcus aureus. Culture of ulcer tissue showed creamy white, waxy colonies which later turned greyish black in color [Figure 6] and [Figure 7]. The lactophenol cotton blue (lcb) mount from colonies showed small oval conidia and hyphae of Sporothrix schenckii [Figure 8]. The organism converted to yeast phase on incubation at 37°C on brain-heart infusion agar.{Figure 3}{Figure 4}{Figure 5}{Figure 6}{Figure 7}{Figure 8}

Thus final diagnosis of sporotrichosis was reached. After investigating him for thyroid hormone assay, serum electrolytes and ECG which were within normal limits, patient was started on oral potassium iodide therapy as per our institution's preference based on experience. He was started on five drops of potassium iodide, given with milk, three times a day with an increase of one drop thrice a day. Patient started showing improvement when he was taking forty drops thrice a day [Figure 9] which we continued for 6 weeks till he showed significant clinical response and started tapering by one drop thrice a day till five drops thrice a day and stopped the therapy.{Figure 9}

At present all the ulcers have healed. There is no recurrence of lesions 1 year after stopping the therapy or no side effects of oral potassium iodide therapy have been observed in this patient [Figure 10].{Figure 10}


Sporotrichosis is a subcutaneous fungal infection caused by dimorphic fungus Sporothrix schenckii. It usually presents as subcutaneous nodules, commonly on exposed parts, in a linear fashion along the lymphatic draining in that area. They usually rupture to form non-healing which may persist for years if left untreated. [5]

The other form of sporotrichosis is fixed cutaneous type in which erythematous, crusted or ulcerated plaques are seen at the site of trauma and do not involve local lymphatics. Mucocutaneous, pulmonary and disseminated forms are also seen.

There have been few reports of sporotrichosis presenting as leprosy like lesions. Mehta et al. have reported a case of a 42 years old man with multiple painless swellings on Lt leg in linear fashion, multiple hypopigmented patches on trunk, Lt common peroneal nerve thickened and biopsy suggestive of Hansen's disease. This patient was initially diagnosed to have sporotrichosis because of typical linear lesions. [2]

Ramesh et al. reported two cases of leprosy who presented with a clinical picture simulating sporotrichosis. The skin and regional nerve trunks were affected in one and in the other the disease was confined to the nerve. Both had features of an upgrading reaction following anti-leprosy therapy, this was seen as erosion and scarring of the plaque and acute onset of abscesses along the easily palpable and thickened nerve that ruptured through the skin. [3]

Ghorpade A reported a case of a 19-year-old boy with hypoesthetic, hyperpigmented patch on right foot since 5 months and multiple erythematous, non-tender, small swellings in a linear sporotrichoid pattern, thickened superficial peroneal nerve. Histopathology was consistent with Hansen's disease (tuberculoid). [4]

Ramesh et al. reported a case of a facial plaque recalcitrant to treatment, which later was diagnosed as fixed cutaneous sporotrichosis. [6]

Mahajan et al. reported 3 cases with unusual presentation of sporotrichosis. First patient had developed sporotrichosis over pre-existing facial nodulo-ulcerative basal cell carcinoma of seven-year duration, due to its contamination perhaps from topical herbal pastes and lymphocutaneous sporotrichosis over right hand/forearm from facial lesion. Second patient presented with disseminated systemic-cutaneous, osteoarticular and possibly pleural (effusion) sporotrichosis. Third patient had multiple intensely pruritic, nodular lesions over/around left knee of two-year duration and was diagnosed clinically as a case of prurigo nodularis and histologically as cutaneous tuberculosis, albeit, other laboratory investigations and treatment with ATT did not support the diagnosis, however responded to potassium iodide therapy. [7]

However no case has been reported where sporotrichosis presented as a borderline tuberculoid leprosy like plaque. Though plaque like sporotrichosis is seen in fixed cutaneous variety, but it is usually crusted or ulcerated erythematous plaque and not a hyperpigmented, hypoesthetic plaque as seen in our patient. Whether the hypoesthesia in this patient was due to induration in the plaque or due to destruction of superficial nerves in the inflammation process caused by localized infection is not clear.


Occurrence of new lesions, different than the existing lesions should arouse the suspicion of a different diagnosis. Uncommon presentations of a known disease can cause difficulties in diagnosis and thus delay the accurate treatment. Efficient laboratory services are needed in such cases. Sporotrichosis or lupus vulgaris may appear as a hypoesthetic plaque mimicking a BT leprosy lesion.


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