A sebaceous cyst is a cyst that is surgically removed when the sebaceous gland becomes blocked and impurities such as sebum that cannot be discharged continue to fill the cystic epithelium. Sebaceous cysts are benign lesions that contain impurities such as sebum that are difficult to be discharged from the sebaceous glands, and have the appearance of white bean curd with an odor. These cysts are not dangerous to health, but they cannot disappear on their own and need to be removed surgically, such as surgical or minimally invasive ionization and laser removal. Sebaceous cysts vary in size. Initially, patients do not experience significant discomfort, but later, if infection occurs, there will be local redness and inflammation and painful reactions. Some cysts may rupture due to external forces and may be temporarily eliminated, but they leave scars on the skin surface and may recur, which can be completely removed only by surgical treatment. In order to avoid the growth of sebaceous cysts, it is necessary to clean the skin well and wash the skin promptly after it secretes oil or gets dusty so as not to block the sebaceous glands and prevent the discharge of secretions. When the skin on the face is itchy, do not scratch it with your hands, as skin breakage leading to infection may also block the sebaceous glands. For acne and folliculitis on the face, do not squeeze them at will to avoid expanding the infection. Sebaceous cysts are usually not self-healing and surgical removal is the better treatment. To avoid re-growth, it is important to clean the skin well on a daily basis.