Hi, thanks for using healthcare magic
It sound like an abscess
which is a collection of pus within a tissue.
The definitive treatment of an abscess is incision and drainage
. Even though pus came out, there may still be pockets or small areas of pus present.
This would also for it to reform.
You need to consider visiting your doctor who can incise the area and remove any remaining pus.
You will then be given a prescription for antibiotics.
I hope this helps