I had it under my arms. At the time I had not yet been diagnosed conclusively with PCOS and therefore I went to a dermatologist. He did some injections (into the boil itself) and I kept having them on and off for months. I still have scars from the injections

This was about 3 years ago. I have not had a reoccurance of them under my arms, belly or anywhere else I can recall. I don't know why I haven't had a reoccurance but I don't think it was the injections because after the first couple that hurt like the dickens and I saw they left scars, I didn't go back to the dermatologist again. I had a couple more that went away or should I say, popped, on their own. How bad can it get? Well I believe I still have problems with it... meaning I know all these skin problems aer NOT acne, but I haven't had any get as big or painful as they were 3 years ago.
Don't know if this answers your question or not, but that was my experiance with it. Dermatologist was a bust IMO BTW.