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Put a little tea tree oil on the affected area.

Ringworm is very contagious, so if you spot it treat it right away! And also be sure to wash all towels, bed sheets, and clothes to make sure the fungus isn’t lingering around somewhere, and also clean the tub.

Cheap and easy - Blue Star ointment - it is basically just camphor and can be found at just about any store that sells other pharmaceuticals.

Beware - put it on and cover it and put it on several times a day.
I've had ringworm spread to all over my body when I was a kid and ended up having to treat so many spots that I had to get an antibiotic. Take good care of it now so it won't spread.