A pressure sore is an area of the skin that starts to break down due to pressure on the specific area of the skin. Usually people who are on a bed for too long can get the name of bed sore where you develop sores on the hells, ankles, and tailbone. 

Sometimes known as “bedsores” or “pressure ulcers”, pressure sores develop after the affected skin area becomes starved by oxygen and nutrients due to bad circulation as pressure is blocking the flow of blood towards areas of the body. Usually people who are at the hospital start to develop a pressure ulcer as they are in a pro-longed position in bed for days without movement. 

There are four kinds of pressure sores that are grouped by the severity of the wound, these stages include:

• Stage I: A red looking and least painful pressure sore is Stage I. This shows the sign of a wound forming. A pressure sore at this stage can be reversed if taken care of promptly and pressure is taken off. 
• Stage II: At stage II, you already have an open sore and pus or fluid may be seen. The red skin starts to blister and the area around it may be irritated. 
• Stage III: At Stage III, it gets to a serious point where the wound extends through the second layer of skin tissue. You now have a sunken hole called a crater. The tissue below the skin may be very painful and needs imitate medical attention.
• Stage IV: Within Stage IV and the most severe stage of all pressure sores, the wound extends down to the bone and there is a high chance of infection. You should immediately be treated at a wound care center continuously and surgery may be required to treat the wound.