Inverted follicular keratosis. 
We reviewed 17 cases of inverted follicular keratosis.  The median age of the patients at the time of surgery was 69 years.  Follow-up in 14 cases showed no recurrences of inverted follicular keratosis, which is a benign skin lesion, often mistaken clinically and pathologically for a malignancy.  Inverted follicular keratosis is characterized histologically by the presence of squamous eddies, acantholysis, acanthosis, and hyperkeratosis.