A serious suggestion with things like infected toes and fingers - the antibiotic-optional treatment I was given (by a microbiologist and endorsed by an immunologist and the GP) was to soak the affected part of the body in water as hot as you can stand it, every three hours. or to be more precise, with three hours between soaking. That means if you start soaking your toe at 2 pm, soak it for half an hour (topping up the dish with the kettle as it cools) and finish the soaking at, say, 2.30 pm, then you BEGIN the next soaking session at 5.30 pm. The aim is to not let it go beyond 4 hours between soaking, there is some flexibility. You try to do this at least three times consecutively, on three consecutive days at least. The more you can do the better.
The theory is - infections begin, and get worse, because bacteria have invaded the tissues and begin to divide. And divide. And divide. This particular regime is for Staph aureus, a common cause of boils, pimples and this sort of infection. It invades through a tiny pinprick, or a tiny crack and then burrows in, growing in the absence of oxygen (anaerobically) when it can be REALLY painful and can get quite nasty. Boils and pimples on the surface are less hassle; they're growing in the presence of oxygen (aerobically).
Whichever way the bugs are growing, the application of heat for more than a minute or two, interferes with the bacterial cell division. It re-sets the bacteria's cell division process, it has to start all over again. Since these bacteria prefer to divide every 4 to 5 hours, then applying heat in LESS than this time, repeatedly, keeps interrupting cell division until eventually the bacteria die of old age.
Bacteria MUST divide within a certain time limit because otherwise they keep on growing until they reach a point where their cell is just too big physically for nutrition etc to percolate all the way through the cell. If a single-celled organism gets too big, it can't survive. So with these bacteria, stopping them from dividing is a fairly quick way to kill them off without needing antibiotics. Or if you ARE taking antibiotics, this method helps along not only by interfering with bacterial division, but also by dilating the peripheral circulation to allow the circulating antibiotics to more effectively reach the site of infection.
Of course you need to talk to the doctor about using this method; don't do it just on my say-so. This method was what I HAD to use because I couldn't take antibiotics without great risk.
I'm glad the rash seems to be easing.
Marg