I don't think its any of those. But I think I shoul see a doctor.
Hello,
It can be due to folliculitis, boil or a sebaceous cyst. Keep the area clean and apply some topical antiseptics. Also wear loose-fitting cotton clothing and use an antibacterial soap or mild soap like dove. Avoid any kind of cosmetics. Topical antibiotics such as Bactroban can be applied.
If the symptoms are severe then please get an evaluation done by 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.