Dynarex Antifungal 1% Clotrimazole USP Cream, 4Oz Tube Dynarex Antifungal Cream 4 oz is an external, topical cream that contains 1% clotrimazole used to treat athlete's foot, jock itch, and ringworm. The Antifungal Cream is also a treatment of superficial skin infections caused by yeast and relieves itching, scaling, cracked, soreness and irritated skin that is associated with jock itch.