Finally became clear of fungal infection after 2 weeks on 250 mg terbinafine. Kept applying ketoconazole daily for two months, even though all areas were clear, just as a preventive of further infection. Also had boiled boxer shorts and socks to kill any remaining spores. Also periodically used ketoconazole shampoo in areas (groin, buttocks). Fungus returned after about two months. Can fungus become resistant to antifungal medications?