Beach holiday foot rash -

This 43 year old gentleman presented with a rash on his foot which he felt was creeping up his foot day by day.   He had returned 3 weeks ago from a beach holiday in the Bahamas where he had enjoyed walking on the beach barefooted.

1.) How is this rash typical described?
2.) What is the name of this condition and the causative organism?
3.) How would you treat this gentleman?