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Skin infection in the arm can cause painful swelling of lymph nodes in the armpit. Local infection: Since lymph nodes drain waste fluids and respond to infections, they can become enlarged due to a nearby infection.Infectious causes of painful armpit lumps include the following. This results in tiny painful bumps in the armpits. Ingrown hair: Shaving the armpit can cause ingrown hairs, where the newly cut hairs re-enter the skin instead of growing out.The armpits are the area most commonly affected. Hidradenitis suppurativa: This condition causes chronic inflammation and sometimes infection, resulting in lumps that can drain smelly fluid and lead to scarring over time.Skin conditions can result in painful armpit lumps, such as the following.

What causes lumps under the armpits? Skin conditions

Painful, swollen lymph nodes in multiple parts of the body.

Groin lesions: The same lumps or lesions on your armpit may also appear on your groin.

Fever: This is a sign of systemic illness.

If you're experiencing a painful armpit lump, it's also likely to experience: Common accompanying symptoms of a painful armpit lump Certain conditions can cause lymph nodes to become enlarged and painful, and the lymph nodes in one or both armpits can be affected. They also contribute to the immune response to infections. Lymph nodes are present throughout the body and drain fluid and waste products that build up due to normal physiological functions. A painful lump in the armpit typically involves either lymph nodes or skin. Your armpit is vulnerable to several painful conditions, especially considering the effects of sweat, friction, bacteria, and hygiene.