"...itis" is infection and /or inflammation. Inflammation is the body's way of dealing with organs or tissues that are not working well. For example, tennis elbow is 'bursitis', that being an inflamed bursa in the elbow...usually from overuse or a blunt force trauma.

In your case, though, it's an infection, and it's serious. It needs to be treated quickly before it causes widespread sepsis and toxic shock. I think that, since you appear to have a firm diagnosis, your best recourse is to scrupulously follow your physician's prescriptions for regimen and medication/treatment. But, also self-monitor very frequently for any degradation in your condition, for any redness creeping out ward to new healthy tissue, for fever, chills, sweats, changes in stool and urine, etc. At the first whiff that things don't seem to be improving after 48 hours of therapy, call your doctor or go to Emerg.

I have gotten skin infections, for some reason almost exclusively on my fingers, usually near the cuticles. That's a filthy spot on everyone's body anyway, but most don't get them infected, not unless they are cut. Mine happen when the cuticle's outer liner begins to fray and stick up and snag on my clothing or on towels. First I get some redness, then it's sore, and then I call and tell them I need a topical antibiotic for the problem. However, and this is only in a pinch, but it will work if you apply it at least twice in 24 hours, tea tree oil is a great antibiotic. I have used it successfully for the lesions I just described, but also for welts in my scalp, probably from the same bacteria since I'm a hair fluffer and scalp scrubber. The trick with tea tree oil is to get on it right away, just a drop over the area and let it soak in...don't let it get rubbed away or off by going and doing anything for a few minutes. It stinks, although not in a nasty way, just strong. And you don't want it anywhere near your mouth, your nares, or your eyes. Keep it away from secreting tissues like tear ducts.