The possibility of sebaceous cyst, lipoma, fibroma and boil is more likely to be considered as the lumps under the testicle, and further examination should be conducted accordingly in order to clarify the cause of the disease. 1. Sebaceous cyst: the opening of sebaceous gland ducts under testicle is blocked, the internal secretion can not be discharged, and then accumulates to form a swelling with a complete capsule, there is no discomfort, and there are small black spots on the surface. 2. Lipoma: mostly related to obesity and high-fat diet, it is lobulated or lumpy, soft and painless. 3. Subcutaneous fibroma: it is a benign tumor, mostly single, hard and painless. Some of the fibroid tumors have the possibility of malignant transformation when they grow fast. 4. Boils: aseptic infections of individual hair follicles and surrounding tissues, with typical manifestations of redness, swelling, heat and pain, and some of them may form abscesses, accompanied by systemic manifestations such as fever and chills. It is recommended that patients go to the hospital to improve the auxiliary examination, in order to clarify the cause of the disease, and the professional physician to give appropriate treatment.