Sebaceous cysts are a type of benign hyperplasia, generally formed by the accumulation of sebaceous gland secretions under the skin, and contain a tofu-dregs-like substance within a sac. If left untreated, the disease can gradually grow larger and may cause pain or rupture. Therefore, once discovered, it is best to go to the dermatology department of a regular hospital to have a minor surgery to completely remove the tofu-dregs-like substance and the sac, which will eradicate the disease and prevent recurrence. It is important to maintain good dietary and lifestyle habits, avoid spicy and stimulating foods, avoid staying up late, anxiety, and stress, do not keep small animals in the home, exercise regularly, and bathe frequently.