Underarm Infections: Causes, Symptoms & When to See a Doctor

Several different kinds of underarm infections or armpit infections can develop. These infections may go away without treatment, but unexplained underarm infections should be evaluated by a doctor.

Skin Infections

• According to the U.S. National Library of Medicine, cysts and other underarm infections can develop on the skin̵7;s surface due to antiperspirant use or shaving.

Abscesses

• Abscesses, or painful large lumps, can grow under the skin of a person̵7;s armpit due to an infection.

Viral Infection

• A viral infection can cause the lymph nodes to swell under a patient̵7;s arms as the body tries to fight off an infection.

Breast Cancer

• Lumps under the armpit can be a sign of breast cancer, especially in women.

Treatment

• Most underarm infections do not require treatment, unless breast cancer is involved. Patients should see a doctor if they have underarm abnormalities that cause pain or tenderness.