REPORT OF A CASE
A 47-year-old man presented for evaluation of erythematous papules and plaques on both forearms that had grown over 4 years. The lesions were described as pruritic and occasionally slightly tender. There was no spontaneous resolution of the lesions and new papules appeared occasionally. The patient had no history of excessive sun exposure, contact with tar, or malignant or benign sebaceous neoplasms, and his family history was unremarkable for skin disorders. He was receiving no medications and he had no known allergies at the time of presentation.Physical examination revealed several well-marginated, round to oval, erythematous, firm, nontender plaques with infiltrated borders on the sun-exposed surfaces of the forearms (Fig 1). There were also several small erythematous nontender papules on the dorsal aspect of the right mid-forearm. The plaques on his forearms varied in diameter from 0.75 to 3.5 cm.An excisional biopsy was performed on a