Cold apple cider vinegar applied to affected area with a cotton ball dramatically decreased the rash and redness that come with tinea versicolor. I think this has something to do with the properties of the acv balancing out the yeast/fungus on the skin. It also helps to orally take 2tbsp. acv with 1/4 tsp baking soda with 8 oz. distilled water 5 days, then break for 2 days. Vitamin C along with the regimn helps with the supposed loss of this vitamin by the sodium bicarbonate. Hope this helps others with this funk, it worked for me, but we all know...things effect people in different ways, so Good luck!