Feel around each breast or side of your chest in a circular motion all the way up to your collarbone and under each armpit.

Medically reviewed by Kashif J. Piracha, MD Armpit pain has many causes. Muscle strain and rashes are common minor conditions. Nerve compression and infections are more serious conditions. Swollen ...

HS in the armpits occurs when hair follicles become blocked, trapping keratin, sweat, and bacteria. This causes painful lumps to form. These lumps rupture, oozing pus and sometimes blood.

The most common place to find cancerous lumps is under the armpit or in the upper outer quadrant of the breast (if you imagine dividing your boob into four, that means the upper section nearest to ...

While it was painful to sit down sometimes, "it never got really bad," she said, until she noticed the same cysts forming under her armpits years later. By the time she was in college, she started ...