Redness and pain on both sides of buttock groove in summer may be due to diseases such as cornual rash, ringworm, intertrigo and so on. For different diseases, the treatment plan is different, and the symptoms can be relieved by general treatment and medication. 1. Corns Rash: also known as prickly heat, summer heat, the patient’s neck, armpits, elbow folds, groin, buttock groove and other parts of the small blisters or pimples, and surrounded by a red halo. Attention should be paid to local dryness, cleanliness, and ice packs can be used to apply ice to the lesions to reduce discomfort; follow the doctor’s instructions for local use of prickly heat powder, glycerite lotion, etc., and if the lesions are serious, hydrocortisone cream can be used as appropriate. If the affected area has pustules, you can use amoxicillin, roxithromycin and other antibiotics. 2. Ringworm: It is a skin disease caused by fungal infection. In summer, patients will have red papules or blisters in the groin, perineum, buttocks and both sides of the buttock groove, and can spread to the surrounding area, accompanied by itching and other discomforts. Scratching of the affected area should be avoided, and if other foci of infection such as athlete’s foot and nail fungus disease are present at the same time, they should also be treated at the same time. And follow the doctor’s instructions to apply miconazole cream, ketoconazole cream, terbinafine cream, etc., extensive lesions, oral terbinafine, itraconazole and so on. 3. Friction rash: because of the folds of the skin rubbing each other, in addition, the summer weather is hot, sweat impregnation can also trigger this disease, resulting in patients around the anus, scrotum, groin, buttock groove on both sides of the appearance of clear boundaries of the erythema, and the swelling is obvious, and can be accompanied by itching, burning pain. The local skin should be kept clean and dry, and can be used as prescribed by the doctor glycerine lotion, hydrocortisone cream, dexamethasone acetate cream, etc., secondary infection, can be used as appropriate, such as mupirocin ointment. In addition, there are other causes can be caused by red pain on both sides of the buttock groove in the summer, it is recommended that patients seek medical attention, identify the cause of the disease and follow the doctor’s instructions for treatment.