What is an eschar?

An eschar refers specifically to dead tissue that has become necrotic and is typically sloughed off from the surface of the skin. This can occur as a result of conditions such as pressure ulcers, burns, or infections. The presence of eschar is significant in medical contexts because it indicates that there has been tissue damage, and understanding its nature is essential for diagnosing and treating underlying health issues.

The other options refer to concepts related to skin injury and healing but do not accurately define eschar. For instance, while a scab involves drying blood and serum that forms as part of the healing process, and a layer of skin serves as a protective barrier, neither captures the essence of dead tissue that is actively sloughing off. Understanding the distinction helps in recognizing various skin conditions and their respective management in medical practice.