Ringworm is mainly caused by the infection of red trichophyton, trichophyton suis, trichophyton verrucosum, trichophyton canis, etc. The reasons for the prolonged treatment may be related to its causative factors, the occurrence of the disease in special parts, personal hygiene, and the patient’s compliance. 1. pathogenic factors: tinea cruris is a fungal disease caused by dermatophyte infections, mainly including Trichophyton rubrum, Trichophyton mustelii, Trichophyton verrucosum and Trichophyton canis, etc. Fungal infections are one of the factors that can easily lead to prolonged incurable disease. 2. special parts: ringworm is good in groin, perineum, perianal and buttocks and other special parts, and these parts are wet, easy to friction, breathability is poor, so often make the lesion inflammation is more obvious, easy to relapse difficult to cure. 3. Personal hygiene: ringworm is transmitted through direct or indirect contact, and can also be caused by the spread of infection through one’s own hands, feet, and nails. Therefore, do not pay attention to personal hygiene will also lead to a long time to cure. 4. Patient compliance: the treatment of jock itch is based on topical medication, which needs to be used for more than 2 weeks or for 1-2 weeks after the lesions subside in order to avoid recurrence, and if the patient is unable to follow the doctor’s instructions and take the medication, it will also lead to the result of prolonged treatment. If ringworm is not cured, it is recommended to go to the hospital in time, after a clear diagnosis by the doctor to arrange a scientific treatment program, do not take it lightly or self-treatment, so as not to delay the condition.