Acneiform lesions in Becker's nevus and breast hypoplasia

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An 18-year-old woman was referred for the evaluation of a dull gray macule on the left breast. From the age of 13 years, the patient noted breast asymmetry beginning with the development of the left breast and the presence of a pigmented stain on its border. Physical exploration revealed hypoplasia of the left breast and a homogeneous, light brown macule on the side of the breast (Fig. 1) without infiltration. Papules and pustules were located mainly around the Becker's nevus on the left anterior chest wall. Biopsy specimens with Fontana's stain disclosed a hyperpigmented acanthotic epidermis. A diagnosis of Becker's nevus, acne, and hypoplasia of the breast was made.

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