If the skin follicles and sebaceous glands are blocked, it is very common to see pathological changes. As the sebaceous gland cells in the skin secrete oil, or follicle mouth cells form keratin, similar to bean scum in the local blockage after the formation of cysts, if squeezed out, in addition to pus and the residue under the skin, and also accompanied by bad odor, oil will generally be discharged through the duct. However, if the secretion is greater than the discharge, the sebaceous gland cysts will be formed as more and more oil accumulates over time. If the abscess is squeezed, the normal physiological structure of the tissues around the abscess will be easily destroyed, which will lead to a chain infection, and in serious cases, sepsis will be induced, endangering life. The sebaceous gland cells will keep secreting oil, which will not be cleaned, but will also make the skin red, swollen, and pus. The correct way is to go to the hospital under local anesthesia to have the cyst removed, and when there is pus, it needs to be cut and drained.