A soft bag growing on the back without pain or itching should be considered whether it is lipoma or epidermoid cyst, and the treatment is mainly surgical excision. 1. Lipoma: If the lipoma is small and has no clinical symptoms, it usually does not need to be treated; if the lipoma is large, accompanied by pain or affects the aesthetics, surgical excision can be considered. 2. Epidermoid cyst: the skin lesion is a semicircular elevated swelling. Surgical excision is required for treatment. If local infection occurs, oral antibiotics should be taken, and surgical excision can be performed at a later stage after the inflammation subsides. If the above symptoms occur, you should consult a doctor in time, complete the relevant examination, clarify the cause of the disease, and treat the cause of the disease.