The redness and tingling on both sides of the butt crack may be due to perianal eczema and ringworm. 1. Perianal eczema: general redness and tingling on both sides of the butt crack, may be perianal eczema, mostly accompanied by itching and other symptoms, repeated scratching of the skin breakthrough can be accompanied by tingling. In this regard, the patient can choose the appropriate drugs under the guidance of a professional physician, commonly used glucocorticoids such as mometasone furoate ointment, or calcium-modulated neural phosphatase inhibitors such as tacrolimus and other drugs for treatment. 2. ringworm: butt crack redness on both sides of the sting may also be ringworm, is caused by fungal infection, can appear itching, redness, stinging and other symptoms, the patient can follow the doctor’s instructions for external use of terbinafine, miconazole and other drugs, to improve. For patients with redness and tingling on both sides of the butt crack, they should pay attention to local cleanliness and hygiene, change underwear frequently, and avoid scratching and stimulation. Symptoms can also be caused by other diseases, it is recommended to consult a doctor in a timely manner, after a clear diagnosis, follow the doctor’s prescription medication.