Hair-follicle nevus or congenital vellus hamartoma.
D000328:Adult; D003937:Diagnosis, Differential; D005350:Fibroma / Q000175:diagnosis; D006197:Hair; D006222:Hamartoma / Q000151:congenital*; D006801:Humans; D009506:Nevus / Q000175:diagnosis*; D012878:Skin Neoplasms / Q000151:congenital / Q000175:diagnosis*