Sebaceous nevus is not necessarily dark brown, may be diverse manifestations, such as flesh-colored, yellowish, reddish, reddish-brown, light brown, dark brown, etc. It can protrude on the surface of the skin, with a dotted granularity and a relatively clear boundary. The cause of sebaceous nevus has not been fully clarified, according to related research, it is believed to be related to family inheritance, gene mutation and other factors. Most patients have obvious symptoms at birth, which are yellowish hairless plaques; after entering puberty, the skin lesions proliferate and thicken, which are light brown or brown, and the surface is papillary or petal-like. If it occurs on the scalp, it leads to localized limited hair loss. The appearance of yellowish, brownish plaques on the head and face, it is recommended to go to the dermatology or plastic surgery department of the hospital, combined with the doctor’s opinion, through liquid nitrogen freezing, carbon dioxide laser, electrocautery or surgical way of treatment.