… Ketoconazole. This is a topical product in the form of a shampoo. It should only be prescribed by a doctor. The prescription strength option is typically used once a day for 2 to 6 weeks while the over-the-counter version is applied daily to the scalp every 3 to 4 days for up to 8 weeks.
Another natural option is tea tree oil. It is a natural disinfectant that works like pharmaceutical antifungal products. Apply a light coating to the affected area two or three times a day, and continue to apply it for two weeks after signs of the infection have disappeared to make sure the fungus is eradicated.