My Husband Had What We Thought Was A Boil On

My husband had what we thought was a boil on his arm,he was on antibiotics for 3 days with no imorovment we ended up going in the hospital where they lanced it and cut it out,he had to go to a clinic every other day to have it cleaned and repacked, now another yellow spot has appeared beside it... imits now going on worried it is a flesh eating bacteria as the hospital never said what this is, it's now a month