I was diagnosed with Hidradenitis Suppurativa about 15 years ago. I was 45 then.
The lumps used to come up UNDER the skin, in my armpits and groin, sometimes as big as a satsuma (incredibly painful) but no head like with a boil.
Over the years before a correct diagnosis, my GP had tried various antibiotic tablets, creams and ointments. I'd also been advised to not shave my armpits, not use deodorant, and to add Dettol to my bath water, and wash with Hibiscrub(the pink soap solution that medical people use).
None of those things worked. The ONLY thing that worked was TRIMOVATE cream on prescription.
I used to also feel unwell, and my lymph nodes used to be enlarged and painful.
Get a proper diagnosis, and get the correct treatment.
I haven't had my particular problem for a few years now, but I know that if/when it flares up, I'll get the cream I need.