★★★★★
As soon as you feel it spreading (for me that is it starts to itch), treat the spot with full strength Thieves essential oil. I keep rubbing in until the itch stops. May burn slightly but you can tell this is a good burn:) Then I cover the area with castor oil. It seems to prevent the spores from coming back immediately.
Repeat as necessary but for me a few applications even for the largest new spots seemed to work.