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Its probably a common fungal infection called tinea. Related to thrush, worse to get in the vagina, anti-fungal powders and creams are readily available at pharmacies (drug stores). Can take a while to clear up. Continue the treatment for about a week after symptoms seem to clear up. A good idea to disinfect shoes worn while the infection is clearing up to prevent re-infection. Avoid in future by regular spaying with untifungal after showering in public shower rooms.

Sounds like poison Oak/Ivy to me. Exactly like it. Spray it w/Ting a spray for fungus infections, but it stops the itch. If you get the liquid somewhere else you could start itching there too. So get the spray (Wal mart) or any drug store.