Ringworm is generally contagious. Ringworm is a dermatophyte infection of the superficial skin of the groin, perineum, perianal area and buttocks, mainly caused by infections of Trichophyton rubrum, Trichophyton mustelii, Trichophyton verrucosum, and Microsporum canis, all of which are infectious. Therefore, ringworm can be infected through direct or indirect contact, and can also spread to other parts of the body through its own skin infection. Ringworm lesions initially appear as red papules, papules or small blisters, gradually developing into scaly red patches, and the edge of the expanding outward, the center tends to subside, forming a clear border ring or multi-ring. Because the affected area is moist and easy to friction, there is often inflammation at the skin lesions, and itching is obvious. Because of the contagiousness of jock itch, you should not share clothes and towels with jock itch patients in your life, and pay attention to personal hygiene. If the symptoms of jock itch appear, please do not self-medication, it is recommended to go to the hospital, under the guidance of the doctor diagnosis and treatment.