What's the quickest remedy for jock itch?

My girlfriend have jock itch. Temperature is very high here. She daily have to wear uniform pant which is a thick material and makes it difficult to heal.

She's using antifungal cream, but not really working. Her periods will start soon and it will probably get worse. Anybody knows any proven way to get rid of it as fast as possible?
What's the quickest remedy for jock itch?
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