Pathologic Quiz Case: A 69-Year-Old Man With a Brown-Black Facial Papule

The document described a case of a 69-year-old man with a brown-black facial papule diagnosed as melanocytic matricoma, a rare and recently recognized benign pigmented papule found in sun-damaged skin of older individuals. Histologically, it was characterized by a dual cell population of matrical and supramatrical cells mixed with dendritic melanocytes. The lesion was well-circumscribed, small, and surrounded by a fibrous capsule, with no recurrence noted after 9 months. Melanocytic matricoma was distinct from pilomatricoma and other similar neoplasms, and its recognition was important for differential diagnosis from malignant tumors like melanoma. Only 5 cases had been reported by the time of this publication, highlighting its rarity.