Subcutaneous lumps are considered to be related to lipomas, epidermal cysts and dermatofibromas. 1. Lipoma: it is usually characterized by localized lumps and bumps, which are mostly found in neck and shoulder, back and abdomen, etc. Its causes are mostly related to regeneration of tumor-causing factors and chronic inflammation, as well as genetic factors. Its etiology is related to regeneration of tumor-causing factors, chronic inflammation and heredity. 2. Epidermoid cysts: their etiology may be related to heredity, and may also be caused by trauma, surgical operation and other factors. Symptoms include a dome-shaped elevated skin mass, moderately hard, mobile, and can occur anywhere on the body surface. 3. Dermatofibroma: its etiology is still unclear, may be related to insect bites, trauma and viral infections and other factors, usually round or ovoid solid nodules as the main manifestation, can be distributed in all parts of the body surface, mainly in the limbs. There are many reasons for subcutaneous pimples, so it is recommended that patients seek medical examination to clarify the cause.