Yes, Ketopz soap (containing ketoconazole and zinc pyrithione) is an excellent, budget-friendly option for tinea versicolor. To use it, apply the lather to your wet back, leave it on for 5 to 10 minutes so the medicine can absorb, and then rinse. Use it daily for 2 weeks to treat active spots. For prevention, use it once or twice a week before summer begins. Antifungal powders (like Clocip or Candid) are great for keeping the skin dry and preventing recurrence, but soaps are more effective for active treatment. Consult a doctor if there is no improvement.