The swelling of a bulge on the side of the foot may be caused by lipoma, sebaceous cyst, bursitis, etc., which can be treated with surgery and oral medication under the guidance of a doctor. 1. Lipoma: Lipoma is a kind of benign tumor, mainly caused by abnormal fat metabolism in the whole body, and the lesion will lead to abnormal proliferation of fat cells, which will make the patient have the symptom of a bulge on the side of the foot. Generally, surgical resection of the tumor is the mainstay. 2. Sebaceous cysts: sebaceous cysts are mainly due to the sebaceous glands are blocked, is the accumulation of sebum formation, after the disease will make the patient appear the side of the foot swollen with a bulge soft symptoms. This disease is mainly to surgical excision of cyst treatment, after surgery can be used iodophor and other drugs local disinfection, reduce the infection rate. 3. Bursitis: Bursitis is mainly caused by traumatic factors, infectious factors, etc., which may cause the patient to have the symptom of a bulge on the side of the foot. Cephalosporin antibiotics, ibuprofen extended-release capsules and other drugs can be taken orally. The side of the foot swollen with a bulge of the patient must wear loose and comfortable shoes, so as not to squeeze the affected area aggravate the condition, and actively consult a doctor, follow the doctor’s instructions for treatment. The above drugs should be used in accordance with medical advice.