Pressure sores or bed sores are sores that form over bony parts of the body when a person lies or sits on that particular part of the body for too long without moving

Where the skin is pressed against the bed or chair, the pressure causes a decrease in the blood flow. If too much time passes without moving or rolling over, the skin and flesh in that area can be injured or die. First a red or dark patch appears, and if pressure continues the skin breaks down creating an open sore