Lumps on the arm may be related to sebaceous cysts, subcutaneous hematomas, lipomas and other causes.
1. Sebaceous cysts: the secretions of sebaceous glands of hair follicles on the arm are blocked in the mouth of sebaceous glands, which can form local cysts, manifested as localized lumps.
2. Subcutaneous hematoma: If trauma such as impact, causing subcutaneous capillary rupture, local hematoma can occur, manifested as a lump on the arm.
3. Lipoma: heredity, eating too greasy, too much mental stress, irritability, endocrine disorders, bad habits such as staying up all night and other factors may lead to fat metabolism disorders and subcutaneous lipoma. Lipoma can occur on the arm and can be surgically removed if necessary.
Lumps found on the arm may be due to other causes, such as fibromas, rashes, parasitic diseases and so on. It is important to consult a doctor for a definitive diagnosis and treatment as prescribed by the doctor.