An 80-year-old man was diagnosed with erythroderma secondary to seborrhoeic eczema 5 years before. His condition had been controlled with emollients, moderate potency topical steroids and antihistamines. He developed painful rashes over the genitals, suprapubic area and upper thighs of 1 week duration. There was associated low grade fever. The rashes were different from the appearance of his chronic eczema. On examination, there was a large area of erosion at the suprapubic area surrounded by satellite erosions (Fig. 1). Multiple smaller erosions were seen on the penile shaft, the glans and prepuce were spared. On the thighs, there were monomorphic grouped vesicles and erosions with erythema (Fig. 2). There were no oral ulcers.
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