Patients with bumps on the inner side of the arm are clinically common for the following reasons: a. Obese patients may have more fatty tissue accumulation on the inner side of the arm, manifesting as uneven bumps-like changes, at which time patients can be examined by ultrasound to clarify the specific nature of the bumps. For small fatty bumps, patients are advised to observe them closely and no special treatment is needed for the time being; if the fatty bumps are larger in size and compress the arterial nerves, patients may experience numbness, swelling and pain in the arms, and patients are advised to undergo surgery to remove them in a timely manner. Second, the patient’s inner arm local pores with blockage, more secretions can form infection, forming sebaceous cysts, at this time can be manifested as multiple bumps. Once a sebaceous cyst is formed, it is recommended that the patient undergoes complete surgical excision as soon as possible to avoid infection in the later stages of the cyst, which can cause significant local pain and seriously affect the patient’s life with prolonged drug changes.