Selsun Blue: Tinea versicolor is caused by the fungus, malasezzia furfura or pityrosporum. We all have it on our skin, but some people get overgrowth causing the unwanted discolored marks usually on the trunk. It produces azaleic acid, which causes the skin to lighten. Products with selenium sulfide can be helpful, although i generally prescribe an oral pill, nizoral, (ketoconazole) taken just twice. Lana long, m.D, .
Answered 5/6/2019
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