What causes large swollen red and feverish areas on your skin that last a few days after pressure from laying or leaning this area for an extended period of time?

The symptoms you describe are consistent with pressure sores, also known as pressure ulcers or bedsores. These are areas of damaged skin and underlying tissue that occur when there is prolonged pressure on the skin, typically over bony prominences such as the heels, elbows, hips, and tailbone.

Pressure sores can develop due to a variety of factors, including:

- Prolonged pressure: When the skin and underlying tissues are subjected to constant pressure for an extended period of time, it can lead to damage. This is often seen in individuals who are bedridden or have limited mobility and cannot change positions frequently.

- Friction and shear forces: Rubbing or sliding of the skin against surfaces, such as bed sheets or clothing, can also contribute to the formation of pressure sores.

- Moisture: Excess moisture from sweat, incontinence, or wound drainage can make the skin more vulnerable to damage and increase the risk of pressure sore formation.

- Nutritional deficiencies: Poor nutrition, especially a deficiency in protein, vitamins, and minerals, can impair the skin's ability to repair itself and make it more susceptible to pressure sores.

- Medical conditions: Certain medical conditions, such as diabetes, poor circulation, and neurological disorders, can affect the skin's ability to heal and increase the risk of pressure sore development.

Pressure sores typically start as areas of redness and tenderness, but they can progress to become deep and infected, requiring medical treatment. Prevention is key in managing pressure sores, which can be achieved through regular repositioning, proper skin care, and addressing any underlying medical conditions or risk factors.