My husband has blood passing in his bowels. He s a diabetic and lately has big boils appearing near his rectum and mostly near upper thigh area. He either is constapated or has diareah. He has knee problems had isn t very mobil. He and I both are disabled in our knees and back some don t get much exercise. He won t go to doctor unless it s his routine, every 2 or 3 months. What is possibly causing the blood in bowels??