“…Several case reports in the literature [2][3][4] refer to the classification of hyperkeratosis of the nipple and areola suggested by Levy-Franckel 5 in 1938, who described the following 3 types: type 1, hyperkeratosis of the nipple and areola representing an extension of a verrucous (epidermal) nevus (this type is usually unilateral); type 2, hyperkeratosis of the nipple and areola associated with other dermatoses such as ichthyosis, acanthosis nigricans, Darier disease, and lymphoma (this type may be bilateral); and type 3, also known as idiopathic or nevoid hyperkeratosis of the nipple and areola, an unusual variant that appears predominantly in women in the second or third decade of life (this type is usually bilateral and according to some authors may appear at puberty, 6 during pregnancy, 7,8 and in men with prostate cancer treated with diethylstilbestrol 9 ). Considering the description of type 1 above, it is apparent that this is an epidermal nevus that happens to involve the nipple and/or the areola, and in this respect it should not be considered hyperkeratosis of the nipple and areola.…”