I get boils and blisters on my scrotum that tend to stay there for a long time. i am std free (tested) i took cephalexin 500mg every 12 hours for 7 days. it did nothing to help. my doctor doesn't seem to care. not sure what to do or what it is. help?

You may be carrying a resistant staph germ in your nasal passages & re-infecting yourself over time. Cephalexin is less active than Bactrim on many strains of resistant staph. You need to treat again and may benefit from placing a small dab of triple antibiotic ointment at the front of your nasal passages 2x/d while in treatment. This can be fixed with effort.