nevus sebaceus on scalp

adenoma basal benign birthmark bump cancer carcinoma care cell close cranial cyst dermatitis dermatofibroma dermatological dermatology disease erosion follicle folliculitis gland hair hairy health hyperkeratosis hyperplasia ill illness infection lesion lump macro malign malignant naevus nevus node nodular nodule overgrowth pathological pathology patient scalp sebaceous seborrheic sick skin tumor