Pleomorphic mastocytoma in an adult.

Cutaneous mastocytoma (CM) is a localized variant of mastocytosis, characterized by an over-accumulation of mast cells in the skin, without extra-cutaneous organ involvement. It is defined as the presence of up to 3 isolated mast-cell skin lesions and commonly develops in newborns and children. We report the case of a 35-year-old healthy Caucasian woman presenting with a 4-year history of a pruritic brown plaque on her left breast.