Depending on the sores, it could either be a rash, an allergic reaction to something( laundry soap, foods, etc.) or it could just be a reaction to a medicine. If I were you though I would go to your...
Warm compresses four times a dayDon't squeeze or try to pop itSee your health care provider if it's getting worse or not improving after 72 hours, or if you have fever, aches, or chills.
it could possibly be a rash or a sisk! i dont really know how to pronounce that word, but my sister had one up there and it was really painful and she had to get it surgically removed.
Theres a chance that if you have blackheads in your armpits and inner thigh areas that you MAY have a condition known as Hidradenitis Suppurativa. Google it and read up on it, it may...
If your your armpit is sore it probably means you have some kind of injury. If the pain is excruciating or abnormal, you should probably go to a doctor or read about it on a trusted medical website.