Hyperplasia is an overgrowth of cells. Sebaceous gland hyperplasia is the overgrowth of the cells lining the sebaceous glands (oil-producing glands). It appears as a round, yellowish or fleshed-coloured lump, with a central depression, mostly on the face. It is associated with exposure to androgen hormones and sun, and is seen more commonly in men than in women.

It is a harmless condition and is only a cosmetic concern. It can be treated effectively by electric cautery or CO2 laser.