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Course: Generalized Nodules in an Older Adult Man

CME Credits: 1.00

Released: 2022-10-05

An otherwise healthy man in his 60s presented to our department with an 8-month history of widespread pruritic papulonodular skin lesions on his extremities and trunk. The patient had been initially diagnosed with nodular prurigo at a local hospital and treated with various topical steroids and oral antihistamines for 2 months, without significant improvement. The skin lesions continued to progress and worsened after scratching. Physical examinations revealed disseminated erythematous papules, hypertrophic plaques approximately 1 to 2 cm in diameter, and dome-shaped nodules with excoriated whitish or pink centers on the scalp, chest, abdomen, back, waist, and extremities (, A and B). Subsequent examinations of the mucosal membranes appeared normal. Other physical examinations as well as his medical and family histories were unremarkable. Peripheral eosinophils, serum total immunoglobulin E level, enzyme-linked immunosorbent assay (ELISA) test for HIV, and results of other routine laboratory tests were within normal ranges or negative. A biopsy specimen was taken from one of the skin lesions on his right forearm for histopathological examination and direct immunofluorescence (DIF) testing (, C and D).


Educational Objective
Based on this clinical scenario and the accompanying image, understand how to arrive at a correct diagnosis.


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