Sebaceous cysts are a type of benign proliferation related to the vigorous secretion of one's own sebaceous glands. Inside the cyst is a sac containing material that resembles tofu dregs. Generally, if the cyst is small, you can break it open yourself or squeeze it out and clean the inside. However, if the sebaceous cyst is larger than the size of a soybean, it's better not to attempt to squeeze or pick it open on your own, as it may not be thoroughly cleaned and could lead to re-infection. If this condition arises, it's best to visit the dermatology department of a formal hospital. After diagnosis by a doctor, the appropriate treatment, usually surgery, can be determined. After recovery, it's important to regulate your diet and lifestyle habits, avoid spicy and stimulating foods, and not to stay up late.