Acneiform lesions in Becker's nevus and breast hypoplasia

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.

Figure 1 Open in figure viewer PowerPoint Hypoplasia of the left breast and a homogeneous light brown macule with acneiform lesions