Inner thigh root rash without itching, need to be treated according to the cause of the disease, such as cherry angioma, generally do not need special treatment; such as syphilis rash, need to choose penicillin drugs; fungal infections, need to choose antifungal drugs; allergic factors, the use of antihistamine drugs. 1. cherry angioma: belongs to skin aging, and age factors, genetic mutation related, generally do not need special treatment. 2. Syphilis rash: Sexually transmitted diseases caused by syphilis spirochete infection, second-stage syphilis may appear syphilis rash, resulting in a red rash on the inner side of the thigh root without itching, the need to choose penicillin-based medication in a timely manner. 3. Fungal infection: fungal infection caused by ringworm, Malassezia folliculitis, may also lead to the inner thigh root rash without itching, can be used externally clotrimazole ointment, terbinafine cream and other antifungal drugs treatment. 4. Allergic factors: contact dermatitis, drug rash and other allergic diseases, the symptoms are mild, may also be manifested as a rash on the inner thighs without itching, you can take loratadine, ebastine and other antihistamines. Rash on the inner thigh root is not itchy, there may be other reasons, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, and follow the doctor’s instructions for treatment, the drug needs to be used under the guidance of the doctor, to avoid self-medication.