Buns on legs may be caused by sebaceous cysts, varicose veins of lower limbs, lipoma and so on. 1. Sebaceous cysts: this disease is mainly due to the excessive secretion of sebaceous glands on the skin surface of the patient, resulting in sebaceous gland mouth blockage caused by, preferably in the face, but can also occur in all parts of the body skin, the patient is often in the onset of the site of the skin, single, hairy, round cysts. When the disease occurs in the patient’s legs, there will be a bag on the legs. 2. Varicose veins of the lower limbs: this disease is usually due to the existence of patients with lower limb venous valve structure abnormality, congenital superficial vein wall weakness and other conditions. Most of the patients will have symptoms such as leg soreness and swelling, leg bruise-like protrusion, etc. Some patients with longer course of the disease may also have skin or subcutaneous nodules on the legs, which will be manifested as long bags on the legs. 3. Lipoma: this disease is a common benign soft tissue tumor, the specific etiology is still unclear, clinical considerations and chronic inflammation, genetic factors and other influences. Patients with this disease often appear in the limbs, shoulders and neck, back and other parts of one or more lumps, occurring in the limbs will appear on the leg bag. There are many clinical reasons that can lead to the growth of bags on the legs, and it is recommended that patients consult a doctor in time for examination to clarify the cause of the disease, and then actively treat it under the guidance of the doctor.