Abscesses or boils: A lump of bacterial infection, called an abscess or boil, can form just under the skin of your armpit, arm, or breast.The following are less common causes of armpit lumps. Inflammation of sweat glands under the arm: This can cause painful, reddened clusters of large and small bumps in and under the skin, and may also be related to infected hair follicles, infected ingrown hairs, or infected insect bites.Ĭontact allergies can cause armpit swelling as one or more lumps.Autoimmune illnesses: These cause inflammation throughout the body that provokes swelling in the lymph nodes.Single-celled parasitic organisms: Toxoplasma gondii can cause flu-like symptoms and lymph node swelling.Fungal infections: Candida, commonly called "yeast," can cause clusters of small swellings under the arm.Viral infections: These can also cause upper respiratory and ear infections, as well as many other illnesses.Bacteria that commonly affect the lungs and other areas include staphylococcus or streptococcus, as well as Mycobacterium and Bartonella. Bacterial infections: These can cause painful, reddened swellings called abscesses or boils.Enlarged lymph nodes: These can feel like lumps under the skin of the armpit and are a sign the body is fighting a systemic disease such as a bacterial or a viral illness. ![]() The most common causes of armpit lumps include the following. The most common are those involving the lymph nodes under the arm, as well as infections and, more rarely, tumors. Many conditions can have an armpit lump as a symptom.
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