Estrogen-induced hyperkeratosis of the nipple.

Hyperkeratosis of the nipple and areola has been classically divided into three categories: a part of an epidermal nevus, a type associated with ichthyosis, and a nevoid form seen in young women. A case of hyperkeratosis of the nipples in a patient with adenocarcinoma of the prostate treated with diethylstilbestrol is described herein. A possible correlation between estrogens and an acquired form of this rare skin disorder is suggested.