What causes a hard lump under the skin on the back?
1. Introduction: Analyzing Subcutaneous Lumps A hard lump under the skin on the back is most commonly caused by benign lesions such as epidermoid cysts, lipomas, or dermatofibromas. In other instances, it may result from a localized infection forming an abscess or, much less frequently, a malignant neoplasm. Determining the exact cause requires evaluating the … Read more