What condition occurs when blood flow to the dermal layer is cut off due to pressure?

The condition that occurs when blood flow to the dermal layer is cut off due to pressure is known as bed sores, also referred to as pressure ulcers or decubitus ulcers. These sores develop when sustained pressure on the skin reduces blood circulation, particularly in areas where bone is close to the skin, like the heels, hips, or tailbone.

When blood flow is compromised, the affected tissue can begin to break down, leading to skin damage and ulcers. The risk of developing bed sores increases with factors such as immobility, poor nutrition, and moisture, which can contribute to skin degradation. Timely repositioning and proper care are essential to prevent this condition in individuals who have limited mobility.

In contrast, the other conditions mentioned involve different underlying mechanisms and processes. Blisters result from friction or burns, cellulitis is a bacterial skin infection, and keloid scars are a result of abnormal healing where excessive scar tissue forms. Understanding the specific causes and characteristics of each of these conditions helps in providing accurate information about skin health.