The groin like ringworm does not hurt and itch consider roseola, erythema, florid chafing rash, and so on. It can be treated with local medication, oral medication, and attention to personal care. 1. pityriasis rosea: this is a self-limiting inflammatory skin disease, the beginning of the cold-like symptoms, and then there will be a rash, mild itching or no symptoms, usually do not need special treatment, is able to subside by itself. 2. Erythroderma: This is an infectious skin disease caused by microscopic rod-shaped bacilli. If the lesion area is small, you can apply erythromycin ointment, and if the lesion is large, you can take oral erythromycin, doxycycline, and so on. Be careful to change and wash underwear and take a bath often. 3. florid chaff rash: this is a fungal infection caused by Malassezia violating the cuticle of the skin, you can apply econazole, ketoconazole, etc., you can also apply selenium disulfide lotion, benzoyl peroxide, and if the symptoms are more serious, you can take oral terbinafine, itraconazole. Personal items should be well isolated from other people to avoid contagion. The groin like ringworm does not hurt and itch, should have to go to the hospital, by the doctor to clarify the cause, standardized treatment, the above drugs should be used in accordance with medical advice.