2 inches by 3 inches!!!! That's bigger than the last time you posted the dimensions!

Do what the wound care chickie said! You risk amputation if you don't get this under control. This isn't something you can just put aside until your winter break.

If you have to, take a basin/bucket in to class and soak there. Soak between classes. Find someone at school (student services) who can hook you up with the resources so you can treat your foot.