Hi Dear, Understanding your concern. As per your query you have symptoms of frictional rash between but cheeks which could be due to clogging of sebaceous glands with dead bacteria and sebum and infection of hair follicle as well. Need not to worry. I would suggest you to wear cotton clothes to avoid frictional heat generation. You should keep the area clean and maintain proper hygiene and dryness. Wash properly with cold water and apply topical antibacterial cream bacitracin. Avoid itching and pricking skin. Take oral antibiotics as well. Visit dermatologist once and get it examined and start treatment after proper prescription. Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari