Alcohol is not a sterilant, it is a disinfectant. Dianyla is right that the protective mechanism of alcohol is very short lived. Betadine is caustic to healthy cells and is being used less and less every day as healthcare learns more about the mechanism of action.
Currently, guidelines indicate chloraprep as a skin prep medication. Once it is allowed to dry, it has a 15 minute length of continued disinfectant action.
As for continued training, I agree with Dianyla. Find a shoe that is less irritating, do your best to minimize friction on the area (clear transparent dressings work great), and work through it. It will heal but will seem to take forever!
Good luck.
If I can't go fast, at least I look good.