Blisters

For the past year I have been getting blisters/pimples/blackheads in between my thighs

I try to exfoliate a lot but doesnt help, I have never been “skinny” so i have usually always gotten chaffing but never got anything like this

Its gotten to a point i have a bad blister where my underwear touches my leg and i can barely walk it hurts sooo much !!