A 72-year-old woman was referred to the dermatology department with a one-month history of non-itching skin lesions in the groin. The rash had been initially diagnosed as impetigo as the lesions started as pustules. However, no improvement was noted on antibiotic treatment. The lesions changed to become larger, warty and vegetating (Fig. 1). Smaller lesions were seen perianally. No vesicles or bullae were noted. She denied loss of appetite or weight loss. There was no relevant drug history.Laboratory tests showed erythrocyte sedimentation rate of 80 mm/h (normal < 28 mm/h) and positive haemoglobin in one out of 3 foecal samples. A gastrointestinal investigation including endoscopy was negative.A skin biopsy was taken (Fig. 2). At the following visit, the patient developed papules and early exophytic plaques on the dorsal side of the tongue. Fig. 1. Vegetating red plaques in the left and right inter triginous regions.Fig. 2. Histological picture (H&E staining): (A) Prominent acanthosis with intraepidermal abscesses. (B) At higher magnification, suprabasal clefts, rounded acantholytic cells and eosino philic infiltrate are seen.