if it's about the size of a macademia nut it may be a pore that is plugged. often from using anti perspiration deodorants. after shower apply rubbing alcohol to the bump and avoid those deodorants. use normal ones
It's probably one of the above, but you can try to pop it. I use to get them from sweating and constantly applying deodorant. So it can be a ball of puss mixed with dried deodorant. Just have a paper towel handy. Lol
1 year ago
Last edited at 11:28PM on 1/30/2012
If the lump is small like a pimple or a boil and has a head, then that's what it is. If the lump is a bit bigger and is sore to the touch, it may be a swollen lymph node under the arm. But if it is high up inside the arm pit and is large and hard and is cutting off the circulation to your arm, it could be a tumor.
Tumors can be cancerous or benign and are not always life threatening. If your lump is on the bigger sized size, you need to see a doctor. Be sure not to squeeze the lump or massage it before you go to the doctor, because if it is cancer it can metastasize and spread through out your whole body. Take care! : D