Ketoconazole ointment can treat ringworm, because there are individual differences, the therapeutic effect varies from person to person, can not be generalized, specific please follow the doctor’s instructions. 1. Ketoconazole ointment is an imidazole antifungal drug, mainly through the inhibition of fungal ergosterol biosynthesis and change the composition of the cell membrane other lipid compounds to play an antifungal effect. Ketoconazole has an inhibitory effect on dermatophytes such as Trichophyton, S. epidermidis, S. microsporum and yeasts such as Candida. 2. Ketoconazole ointment is commonly used in the clinic for ringworm, tinea pedis, tinea corporis, tinea cruris, tinea pedis and cutaneous candidiasis. For most people, the above diseases can be effective soon after applying ketoconazole ointment, but in order to minimize recurrence, it should be used continuously for 2~4 weeks, and tinea cruris should be used continuously for 4~6 weeks, please follow the doctor’s instruction. 3. It is prohibited for those who are allergic to ketoconazole, imidazoles or sulfites, and for those who are allergic to any components of this product. It should be noted that ketoconazole ointment should not be used on broken skin; it should not be used on a large area. In the process of medication, there may be adverse reactions such as burning sensation, redness and swelling at the site of medication, the medication should be stopped in time, the local medication should be washed off, and the physician should be consulted in time. It is recommended that patients with jock itch try to avoid wearing tight-fitting underwear or chemical fiber underwear, consult a professional doctor before using ketoconazole ointment, and follow the doctor’s instructions for medication.