There are many possibilities for bumps on the arms, and the more common ones are multiple lipomas, which are generally soft, have clear borders, are mobile, and are lobulated. Most patients with multiple lipomas are benign lesions and rarely become malignant. In this case, regular observation and follow-up can be given, and if it increases rapidly within a short period of time or if there are painful symptoms, surgical removal under local anesthesia can be considered. In the case of fibroids, surgical excision under local anesthesia is recommended, and the scope of excision should be expanded appropriately to avoid recurrence after surgery. For patients with postoperative pathology showing malignancy, reoperation should be performed to expand the scope of resection and, depending on the situation, to remove part of the muscle, fascia, etc., in order to reduce postoperative recurrence and prolong the patient’s survival. If necessary, further treatment can be chosen according to the pathological findings. In addition, tendon sheath cysts may appear, caused by long-term friction of the tendon sheath, and are generally considered to be surgically removed under local anesthesia, with pressure to rupture and bleed if necessary, or puncture and fluid extraction, intracavitary injection of sodium hyaluronate, etc., but the recurrence rate is high.