Selsun Blue Shampoo

I get the white pigmentation spots when I tan in summer. Someone told me that a fungus caused by sunlight and perspiration. A dermotologist said Selsun Blue shampoo applied to the skin gets rid of him. How long and how often should it be applied?

Coat the affected area, let it dry and sleep on it. Wash in the shower in the morning. 2-3 sessions should. From someone who has tried.
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twice daily for 4 consecutive days.
Just use it as if it were a liquid soap or liquid soap.