A rare case of nevoid psoriasis

Sir, a 16-year-old boy presented in skin OPD with an itchy, plaque on the dorsal aspect of right hand on the lateral side for a duration of twelve years. The lesion started as a small, raised, thick plaque which gradually increased in size to acquire the present size. The patient had applied mid-potent topical corticosteroids in the past but there was no relief. There was no seasonal variation on the growth of the lesion. On examination, brown-coloured, verrucous plaque involving the dorsal aspect of index finger and thumb extending to involve the lateral part of dorsum of hand up to the wrist joint was present. There was mild scaling on the plaque and Auspitz sign was positive (Figure 1). There was no similar lesion elsewhere on the body. Nail and mucosae examination were within normal limit. We kept the differential diagnosis of inflammatory linear verrucous epidermal nevus and linear psoriasis and sent a skin biopsy for histopathologic examination.