Alopecic and Aseptic Nodules of the Scalp: First Report in South America and Second in America.

Alopecic and aseptic nodules of the scalp, also named pseudocysts of the scalp, are a relatively new, little-known, and for sure underdiagnosed disease. It affects mostly young men and is characterized by a solitary or a few dome-shaped nodules accompanied by nonscarring alopecia, deep inflammatory infiltration in the skin biopsy specimen, and, in most cases, granulomas. It has a good response to doxycycline, intralesional corticosteroids, or drainage/aspiration of the lesion. We present a case report and a summary of the published cases.