Tolnaftate. Athlete's foot is so well-known in the sports community that a trial of this over-the-counter remedy is worthwhile before a physician's office visit is considered. If it's scabies instead, it will be obvious that the antifungals are not working. If you don't have a good result after two weeks of topical treatment, get with your physician.
Topical meds. Creams and lotions. Some are available over the counter. But the diagnosis may be something else. So before running to your local drug store to buy a tube of athletes foot medicine, check with your doctor to be sure it isn't something else.