Hello,
I cannot confirm anything without examination but it can be boils or abscess, cysts or hidradenitis suppurativa. Hidradenitis suppurativa is a skin disease that affects areas bearing apocrine sweat
and keep the area clean. Topical antiseptic treatment and topical antibiotics such as mupirocin or neomycin containing ointment is very useful. If still the lumps persist then you should get them examined from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.