Warning signs of bedsores or pressure ulcers are: 
Unusual changes in skin color or texture
Swelling
Pus-like draining
An area of skin that feels cooler or warmer to the touch than other areas
Tender areas
 Bedsores fall into one of several stages based on their depth, severity and other characteristics. The degree of skin and tissue damage ranges from changes in skin color to a deep injury involving muscle and bone. Common sites of pressure ulcers For people who use wheelchairs, bedsores often occur on skin over the following sites: 
Tailbone or buttocks
Shoulder blades and spine
Backs of arms and legs where they rest against the chair
 For people who need to stay in bed, bedsores may happen on: 
The back or sides of the head
The shoulder blades
The hip, lower back or tailbone
The heels, ankles and skin behind the knees
