I've been getting bumps in between my thighs and armpits that started to become painful, i believe it is a cyst and is underneath my skin and not the surface. When I've removed them, pus and blood gush out but they reoccur weeks later in different spots. Ive been to the doctor already and she prescribed me some antibiotics but it did not work. So she concluded theirs nothing she could do and that it is untreatable. Please explain to me what it is and what I could do to treat it.

Thank You