Sebaceous cysts are called sebaceous cysts in medicine, and their recurrence is related to bacterial infection and incomplete surgical excision. 1. Bacterial infection: sebaceous cysts are cysts formed by the blockage of sebaceous glands. The etiology of sebaceous cysts is mainly related to the occlusion or narrowing of the openings of sebaceous gland cystic ducts, therefore, local bacterial infection will easily lead to the recurrence of sebaceous cysts. 2. Inadequate surgical excision: Surgical excision is one of the commonly used methods in the treatment of sebaceous cysts. Generally speaking, surgical removal of cysts can be a better treatment for the disease, but if the wall of the cyst is cut and broken during the surgical operation, resulting in the residual wall of the cyst, then sebaceous cysts may recur again. Patients with sebaceous cysts should maintain good living habits and pay attention to personal hygiene to avoid clogging of pores or sebaceous glands due to accumulation of metabolites and dust secreted by the skin. Eat a light diet, avoid spicy and greasy food, and avoid endocrine disorders that lead to excessive sebum secretion. There are many reasons that lead to the recurrence of sebaceous cysts, and it is recommended that patients go to regular hospitals in time and be treated under the guidance of doctors.