A Decubitus Ulcer, also called a pressure sore or bed sore, is an open wound on your skin. Pressure sores often occur on the skin covering bony areas. The most common places for a pressure sore to appear includes your hips, back, ankles, and buttocks. It is common among the elderly, disabled, and other people who spend long periods in bed or a wheelchair, or cannot move certain body parts without help. Decubitus ulcers are also prone to those with fragile skin. The condition is highly treatable and recovery is good with proper diagnosis and treatment.