A friction blister is an example of which type of lesion?

A friction blister is classified as a bulla, which is a type of lesion that is characterized by the presence of a fluid-filled sac that is larger than 0.5 centimeters in diameter. When the skin experiences friction, such as from continuous rubbing or abrasion, the epidermis separates from the dermis, leading to the accumulation of lymphatic fluid between the layers. This results in a blister, also known as a bulla.

Bulla are typically raised and can be easily recognized due to their size and the fluid they contain. In contrast, pustules are small elevations of the skin filled with pus, macules are flat, discolored spots on the skin that do not have a raised texture, and papules are small, raised lesions that are typically solid. These different types of lesions serve various purposes in dermatology and are identified based on their characteristics, helping professionals diagnose skin conditions accurately.