Sebaceous cysts, the most common benign tumor of the scalp. It is often found incidentally as a mass on the scalp and is usually painless and itch-free, or painful if infected. When touched, it is movable and feels like rolling, with occasional pressure pain. It has clear borders, is hard and elastic in texture. The scalp color of the lesion area is generally normal. The duration of the disease is particularly long and slow-growing, ranging from three to five years, and from ten to eight years. The cause of the disease may be related to poor secretion of sebaceous glands in the scalp and infection. Treatment Cystectomy is usually performed under local anesthesia, without general anesthesia and at low cost, and postoperative oral anti-inflammatory drugs are sufficient. Prognosis Most of the cysts are cured once, but a small percentage of recurrence requires a second operation. The cause of recurrence is the rupture of the cyst envelope, contamination of the surgical area by the contents or residual cyst wall.