What is a blister commonly defined as?

A blister is commonly defined as a small, thin-walled lesion that contains clear fluid. This definition highlights the essential characteristics of a blister, which typically arises due to friction, burns, or other forms of irritation that cause the separation of the skin layers, resulting in a pocket of fluid. The clear fluid within the blister serves as a protective measure, cushioning the underlying tissue from further damage while it heals. Understanding this definition is important in the context of coding and documentation, as it helps differentiate between various skin lesions and their treatment protocols.