Pressure sores are not contagious or cancerous. Spots progress to blisters, then ulcers, leading to a breakdown of tissue under the ulcer.
Ulcers are usually painless.
Pressure reduces the blood supply, causing death in the tissue layers. Pressure sores usually develop in persons who cannot move because of chronic illness or disability that confines them to bed. Decreased or absent sensation. Illness or accident requiring prolonged bed confinement, especially with unsanitary living conditions and wrinkled or wet bed linen. Control of fecal or urinary incontinence.