Pink tumors are sebaceous cysts that protrude from the surface of the skin and occur in areas rich in sebaceous glands, such as the scalp, face, and chest and back, and most grow slowly. When there is no co-infection, patients usually have no conscious symptoms. The swelling is spherical, single or multiple, and varies in size from a few millimeters in the smaller ones to nearly 10 cm in the larger ones. They are moderately hard, elastic, higher than the skin surface, adherent to the skin, not easy to push, smooth surface, no sense of fluctuation, and have a needle-sized umbilical concave opening in the central part. Cancer of sebaceous cysts is extremely rare, but they are prone to secondary infections, and if they are complicated by infections they can show red, swollen, hot and painful inflammatory reactions. Cysts can rupture under external force and temporarily subside, but scarring will be formed and they are prone to recurrence.