Armpit is the armpit, a small flesh grain growing in the armpit may be caused by sebaceous cysts, filiform warts, swollen lymph nodes in the armpit, fibroma and other diseases. They can be treated with oral medication, physical therapy or surgery. 1. Sebaceous cysts: Sebaceous cysts can occur in the armpits, and the cysts can gradually increase in size and rise above the surface of the skin. Small cysts can be left untreated, while large cysts can be surgically removed. If combined with infection can be given cephalosporin, penicillin and other anti-infection, infection control can also be surgically removed. 2. Filiform warts: Filiform warts are caused by human papilloma virus infection, resulting in the local appearance of thin, soft, length of not more than one centimeter of superfluous organisms. Physical therapy, such as carbon dioxide laser and microwave, is a common method of treating filiform warts. 3. swollen lymph nodes: swollen axillary lymph nodes lead to local redness, swelling, pain and other inflammatory manifestations. Cephalosporin and amoxicillin can be given for anti-infection treatment. 4. Fibroma: Fibroma is a soft tissue tumor, the cause of which is still unclear, can occur in the armpit, resulting in local pain or painless swelling, generally benign lesions, the preferred treatment is surgical excision. The first choice of treatment is surgical excision. Small meatballs under the armpits are related to a variety of factors, and it is recommended not to deal with them on your own, but to go to the hospital for examination and treatment under the guidance of the doctor.