Small meatballs under the armpits may be caused by filiform warts, lipomas or skin tags, which can be treated through lifestyle adjustments, medication, physical therapy, surgery, etc. 1. filiform warts: the small meatballs in the armpits may be caused by filiform warts, filiform warts may be infected with human papillomavirus, you can apply imiquimod cream and other antiviral treatment, you need to pay attention to cleanliness and hygiene, wash your hands in time after touching the diseased area to avoid infection, you can also be through the laser, freezing and other physical therapy on the treatment of filiform warts. 2. Lipoma: the small meatballs in the armpits may be caused by lipoma, which can be removed through surgical excision. 3. Dermatomas: also known as soft fibrous tumors. It is a benign tumor formed by the proliferation of fibers due to the stimulation of many factors. It can be treated by physical therapy such as laser, freezing, or surgical excision. Once the patient found his armpit has a small meatball, it is recommended to consult a doctor in a timely manner, improve the relevant examination after the targeted treatment and treatment. In addition, drugs may cause side effects, medication should be under the guidance of a doctor, do not blindly use drugs.