A 29-year-old man presented with an asymptomatic thick scaly plaque on the umbilicus (Fig. 1A). The lesion was incidentally found by the patient himself the day before he visited the clinic. He reported no history of any preceding eruption, injury to the skin or any family history of skin diseases. On the physical examination, there was a hyperkeratotic plague on the umbilicus with silvery scales. During skin biopsy, gentle swabbing with H2O2 and saline gauze was done. Histopathologic examination showed orthokeratotic hyperkeratosis and anastomosing rete ridges (Fig. 2). He was not given any other medications and the patient revisited our clinic 10 days after the skin biopsy.
Fig. 1. (A) Initial picture: a hyperpigmented plaque with adherent silvery scales on the umbilicus. (B) The picture 10 days after the skin biopsy: the lesion was completely resolved after swabbing with H2O2 and saline gauze.
The hyperkeratotic lesion was cleared and he reported that the swabbing with H2O2 and saline gauze during skin biopsy made the lesion disappear (Fig. 1B).
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Fig. 2. The epidermis shows orthokeratotic hyperkeratosis and anastomosing rete ridges (H&E, x100).
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