Pilar sheath acanthoma.
D004848:Epithelium / Q000473:pathology; D005153:Facial Neoplasms / Q000145:classification / Q000473:pathology; D006201:Hair Diseases / Q000473:pathology*; D006222:Hamartoma / Q000145:classification / Q000473:pathology; D006801:Humans; D010212:Papilloma / Q000145:classification / Q000473:pathology*; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000145:classification / Q000473:pathology