My brother, who is a plumber, recently had an episode of something like you are describing. It began as a spot the size of a dime and he went to the doctor with it. It was staph he was told. He took three rounds of Antibiotics to knock it down and was not sure it was going to do it. It was the size of a quarter by the time the medication began to be effective and 6 weeks later. He was pretty stressed about it, and it was expensive medicine.
I was going to send him some Oil of Oregano which will wipe out staph when it finally responded to the meds he was taking.