Less commonly, the pain—referred to as axillary pain—may be due to an autoimmune or arterial disease, nerve compression, and malignancies like breast cancer.The diagnosis of armpit pain may involve ...

The rash can be sore, itchy, and irritated from sweating ... If cancer reaches the lymph nodes, you may feel a lump in your armpit area. Most skin lymphomas have no known cause.

armpits, and groin. A swollen lymph node may be painful and tender to the touch. In some cases, it will be visibly enlarged under the skin, but in others, it will be smaller or deeper in the body ...