sounds like you have vessicluar tinea pedis....athlete's feet.
soak your feet in epson salt and water to dry out the feet. apply over the counter lotrimin/lamisil cream to the area twice daily for 4 consecutive weeks.
keep the foot dry and wear breathable shoes. if it doesn't improve or seem to worsen, see a podiatrist for further evaluation and treatment.
Thanks for your question. I was just logging on to find the exact same information! Wow! That is great. I'll be waiting for the answer, too. Thanks!