Hans got that on his paws after running around on Bermuda grass. The vet prescribed Neopredef powder and an antibiotic cream. We had to do this for 14 days, but it went away.
As for the skin issues, they didn't go away until I started doing this:
A Simple Remedy to Treat Dog Skin Infection
I also started giving him an olive extract capsule in the morning, one borage oil capsule in the afternoon, and one evening Primrose capsule at night.
I still have to keep an eye on his groin area, and I have an antibiotic ointment I use, to target any appearing spots.
By the way, Alpha animal hospital in Fairfax is really great. Dr Segl is the one to see.