Hello, Tinea versicolor is a superficial fungal infection which can affect anybody. It manifests basically in summer or humid season and therefore the best measure of prevention is by avoidance of hot an humid weather. In my patients I prefer to use latest of anti-fungal lotions such a sertaconazole applied at night time for around 2-3 weeks of period. If required I prefer to give an anti-fungal tablet such as fluconazole or ketoconazole by mouth in required dose. Over all you should maintain hygiene at your best to prevent the recurrence. All the best.