Hello,
For the removal of the cyst, it has to be drained. Usually cysts are painless and generally no treatment is required but they become painful then it means they are infected,Then surgical excision by traditional wide excision, minimal excision, and punch biopsy excision may be required.
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 dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
it could be a boil, which sometimes needs to be surgically drained (they just put a small cut on the surface to let the pus come out)
he needs to get it looked at by the doctor and they should know what to do. Most likely they'll know what it is when they look at it.