There is a hard lump under the left side of the rib cage, which is painless and itchy, and it may be sebaceous cyst, lipoma, fibroma, etc., which need to be treated with medication or surgery. 1. Sebaceous cysts: they are cysts formed by the gradual accumulation of sebum, and if they affect the aesthetics, cystectomy can be performed. 2. Lipoma: it is a kind of common soft tissue benign tumor, which is composed of mature fat cells. Prednisolone and other glucocorticosteroids can be injected to reduce the size of the lipoma as prescribed by the doctor, but it can’t be completely eliminated, and surgical resection can also be performed. 3. Fibroma: it is a benign tumor of fibrous connective tissue, and its preferred treatment is surgical excision. There is a hard lump under the left side of the rib cage but it does not hurt or itch, there may be other disease factors, it is recommended that the patient go to the regular hospital in time, to clarify the cause of the disease, standardized treatment.