Sebaceous cysts secondary infection may appear local pain, redness, swelling, pus, ulceration and other symptoms, it is recommended to consult a doctor in time. Sebaceous cysts are mostly found on the face where sebaceous glands are abundant, and they are mostly single, round, smooth, and higher than the skin surface, and their contents are usually grayish-white curd-like with foul odor, and powdery substance can be overflowed after squeezing. As sebaceous cysts contain rich sebum and other substances, easy to lead to bacterial growth, when the occurrence of sweating, scratching, squeezing and other behaviors, it is very easy to secondary infection, local redness, swelling, pain, the original increase in the size of the lumps, the surrounding tissues and other uncomfortable symptoms, if the treatment is not timely and may even lead to ulceration, and in severe cases, can also be accompanied by fever, fatigue and other systemic symptoms. Patients with sebaceous cysts who have the above symptoms and are suspected of secondary infection should consult a doctor in time, make a clear diagnosis under the guidance of the doctor, and follow the doctor’s instructions for appropriate treatment.