HS in the armpits occurs when hair follicles become blocked, trapping keratin, sweat, and bacteria. This causes painful lumps to form ... sinus tracts can form under the skin between the lesions ...

After a while I began to get small painful lumps under my armpits about once every two weeks or so. They last about a day and then disappear. I started using deodorant again but I keep getting them.

The armpit is rich in sweat glands and the pores from these can become blocked, which may go on to become infected, causing a sore lump. Many of these do eventually go on their own, so leave it ...

The most common place to find cancerous lumps is under the armpit or in the upper outer ... This is done under local anaesthetic and is not usually painful, just a little uncomfortable.