The face has a hard lump inside the side, if not caused by post-traumatic bruising, the most common spontaneous appearance is epidermal cysts, in addition, it may also be lymph node enlargement, etc., the specific should go to the hospital for differential diagnosis. 1, epidermal cysts: that is, the gradual accumulation of sebum forming cysts of benign skin lesions. Prevalent in the head and face, round in shape, medium hardness or elastic, smooth surface, the base can move. Epidermal cysts often have a black pinpoint-sized depression in the central part of the skin, and white contents can be produced by pressing the periphery. Usually treated by medication and surgery, epidermoid cysts with inflammatory reactions often show sudden enlargement and redness and pain, and can be treated with topical mupirocin ointment or fusidic acid cream, or in severe cases with oral broad-spectrum rosmarinic acid dispersible tablets or application of penicillin V potassium tablets. If the cyst is not accompanied by inflammatory reaction, it can be surgically removed; 2. Swollen lymph nodes: If the lymph nodes at the cheeks are swollen due to mouth ulcers or gingivitis, anti-inflammatory and anti-infective treatment is usually carried out using drugs, commonly used drugs include penicillin, cephalosporins, quinolones, etc. to actively control inflammation, while watermelon cream tablets can be used. If the swollen lymph nodes do not disappear, a lymph node biopsy should be performed to further determine the condition; 3. The patient should go to hospital for active examination and treatment.