Pregnant women with pus in the buttocks are considered to be related to sebaceous cysts, boils, perianal abscesses and other factors, which can be relieved by incision and drainage of pus and anti-infective drug treatment. 1. Sebaceous cysts: sebaceous cysts are actually a misnomer for epidermal cysts and are generally non-inflammatory, but can become inflamed and suppurative after pressure or secondary infection, and can be treated with incision and pus removal in the surgery after the occurrence of this phenomenon. 2. Boils: pus on the buttocks of pregnant women may be related to boils, mainly caused by infection with Staphylococcus aureus, can cooperate with the doctor to choose anti-infective drugs, such as amoxicillin, cephalexin and so on. 3. Perianal abscess: pus on the buttocks may also be related to perianal abscess, once diagnosed, should be given as soon as possible to cooperate with the doctor to give the abscess incision and drainage treatment, to prevent further aggravation of the symptoms of infection, and do a good job of post-operative care. If the pregnant woman’s buttocks long abscess symptoms are serious, should go to the hospital in time, follow the doctor’s instructions for treatment.