Butt very itchy scratched red pimples that pimples with itching as a symptom of the disease, may be eczema, contact dermatitis, jock itch due to, can be through the general topical drugs, oral medication and other measures to regulate. 1. Eczema: internal and external stimulation of a variety of factors causing inflammatory skin reactions, local skin can be manifested as erythema, red pimples, can cause the buttocks very itchy and scratched. External zinc oxide ointment, boric acid solution and other medications; you can take loratadine, cetirizine and other antihistamines. 2. Contact dermatitis: when the skin in the buttocks area comes into contact with allergy-causing substances or the allergic reaction caused by the body taking medicines and food, red buttocks pimples with itching and scratching can appear. You should avoid touching the allergic substances again. You can use zinc oxide ointment, secondary infection, with erythromycin ointment; oral prednisone tablets, dexamethasone tablets, chlorpheniramine, ibastine and other drugs. 3. ringworm: fungal infection caused by ringworm skin diseases, can appear red pimples, can also cause buttocks very itchy and scratched. Topical clotrimazole ointment, terbinafine cream, etc.; the condition is more serious or recurrent patients, you can take oral fluconazole capsules, terbinafine tablets and other drugs treatment. Butt very itchy scratched red pimples, there may be other reasons, it is recommended to go to the hospital for examination, clear cause of the treatment as prescribed by the doctor, do not self-medication.