For tinea versicolor, Selenium sulphide lotion can be applied for around 10-15 minutes, rinsed off and re-applied daily for about a week. It is less messy and preferably easy to use than the Selsun and Ketoconazole shampoos which needs to applied on the patches of affected skin after an evening bath, left to dry the whole night and washed off the next morning. For widespread or stubborn infections, itraconazole tablets have shown good results in curative aspects but should always be used under a dermatologist’s supervision.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.