Inner thigh root rash ulcers need to be treated according to the cause of the symptomatic treatment, the general use of medication, common causes include allergic dermatosis, ringworm and so on. 1. Allergic dermatosis: allergy-prone people, when the thigh root comes into contact with certain allergens, such as underwear, clothing, cushions, etc., it is possible to induce allergic dermatosis, manifested in the appearance of erythema on the surface of the skin, pimples, ulceration and other symptoms, accompanied by varying degrees of itching, tingling, redness and swelling, and so on. Local topical glucocorticoid creams, such as compound dexamethasone cream, Dinaid cream, etc., the symptoms are serious, at the same time, oral antihistamines, such as loratadine tablets, cetirizine and so on. 2. Tinea cruris: patients themselves suffer from tinea cruris, tinea pedis, tinea cruris, contact with the towels of patients with tinea corporis, often wear tight pants, etc. may trigger tinea cruris, manifested as a ring or semi-ring red rash on the surface of the skin, due to the poor permeability of the root of the thighs and moist and sweaty, but also often friction, prone to ulceration of the symptom. Local topical antifungal ointment, such as clotrimazole ointment, bifonazole cream, etc., the symptoms are serious, can be combined with oral terbinafine hydrochloride tablets and other antifungal drugs for treatment. All of the above drugs have adverse reactions and are recommended to be used under medical supervision. Rash ulcers on the inner thigh root, there may be other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease to give targeted treatment.