Enlarging Bump on the Scrotum.

Extramammary Paget disease is a rare, slow-growing intraepithelial neoplasm of the skin or its underlying appendages. It more commonly affects the apocrine glands of the axilla, vulva, perianal region, scrotum, and/or penis. It often presents as a well-demarcated, thickened, erythematous, or gray-white scaly plaque with indolent growth that may become ulcerated, crusted, papillomatous, or eczematous over time. Pruritus, pain, and burning sensations are common symptoms; however, they are not appreciated by all patients. Many patients are erroneously treated for eczema for months to years before a proper diagnosis is reached. Patients presenting with chronic genital or perineal dermatitis or skin lesions that have been unresponsive to topical therapy should be biopsied for definitive diagnosis.