The following herbs are anti-fungal, which you could apply topically for tinea versicolor:
– Calendula 90% tincture (Calendula officinalis)
– Tea tree (Melaleuca alternifolia)
– Cedar (Thuja occidentalis)
– Pau d’arco (Tabebuia impetigninosa)
You can make a spray out of the tincture (either one or all in a blend) and spray on the affected area 2-3 times a day, letting the spray dry and reducing moisture.
You could also make a cream that you apply 2-3 times a day.
I hope this helps! Let me know if you have other questions.