If an infection occurs in a sebaceous cyst, surgery cannot be performed. The infection needs to be controlled first, and if an abscess has formed, it should be incised and drained, and surgery should be considered after the inflammation has completely subsided. Surgery is often not completely removed due to inflammation and is prone to recurrence. If the sebaceous cyst is large, similar to the size of peanut rice, it needs to be removed by local surgery, and the cyst membrane needs to be removed completely, and it is not easy to recur. Therefore, if sebaceous cysts are suspected to be malignant, they should be removed early and the diagnosis should be confirmed by pathological examination.