It sounds and looks like it could be MRSA. I have been dealing with the same thing for a year now. It went away for a while but just recently came back. I was using Colloidal Silver alone on my boils and it helped some but then I mixed it with Bentonite clay and had much better results. I just mixed some Colloidal Silver with the clay and put a thick layer over my boils with a bandage and it draws the infection out and heals a lot faster. I also take the Colloidal Silver internally.