Cysts (fluid-filled tissue pockets), infections, and swollen lymph nodes commonly cause armpit lumps. Finding a lump in your armpit can be worrisome, especially if it hurts or appears unexpectedly.

Is an Armpit Lump a Symptom of Breast Cancer? An armpit lump is an enlargement or a swollen bump that develops where the underside of your arm joins your shoulder. It usually develops beneath the ...

Painful armpit lumps are often due to a swollen axillary lymph node under the armpit. This is usually a sign that the body is fighting an infection, but it can sometimes indicate cancer.

However, it is important to seek medical attention if an armpit rash persists for more than two weeks despite home remedies, says Dr Gopal, adding that if the rash becomes painful, swollen ...