I've had tinea versicolor for 30 years; more seasonal in nature. Any OTC help available for this?

Selsun. Seleoum sulfide will work in most cases, as well as otc antfungal crea, s such as lamisil (terbinafine).
Selsun Blue shampoo. Tinea versicolor if a fungal skin infection, usually on the back, chest, abdomen, and neck. Selsun blue shampoo, containing selenium, can help. A person can put selsun blue on the rash areas, wait 10-15 minutes, and then take his regular shower. If he does this once a day for 3 days, then once a week for 3 weeks, and then once a month, it should work. Skin color takes many months to even out.