Hi. Thanks for your query. Noted the history and understood the concerns. Cracked butt crack is basically a skin problem due to weak skin and may be accumulation of sweat and dead skin giving some sinfection and further weakening the skin. Also present is the friction force while being active. Hence nothing serious about it like STDs or Herpes. This needs the following treatment. Clean the area with Liquid Povidone Iodine, let it dry. Use loose clothes. Take multivitamins and therapeutic dosages of Vitamin A and D. About the hard stools: This causes crack at the anal verge and is called fissure-in-ano. The treatment is as follows: Stool softener and laxatives to keep stools soft. High fiber diet, avoid the foods and beverages that cause constipation. Sitz bath in a tub with warm water. All these things will help to solve your problems till you get constipation again. Avoid stress and anxiety.