A lump on the arm may be caused by lipoma, sebaceous cysts, common warts and other diseases.
1. Lipoma: Lipoma is a common benign soft tissue tumor that occurs in the limbs and trunk, and is usually a small painless lump that can be confined to the subcutaneous and peritoneal areas.
2. Sebaceous cysts: Sebaceous glands are glands located in the epidermis with ducts opening into the hair follicles. Sebaceous cysts are located in the epidermis and have ducts that open into the hair follicles. They are common in areas of high sebum secretion, such as the limbs, face and back. They appear as smooth, elastic nodules protruding from the surface of the skin.
Mainly may be congenital developmental abnormalities or trauma and other causes. The patient will have a smooth surface, dome-shaped swelling under the skin, can appear in any part of the human body.
3. common warts: mainly caused by human papilloma virus infection caused by skin mucous membrane lesions. It can be manifested in the arm long meat bumps, at the same time there is a certain degree of contagious, need to be timely treatment.