A friction blister is categorized as which type of lesion?

A friction blister is classified as a bulla due to its characteristics. Bullae are fluid-filled lesions that are larger than vesicles, typically exceeding 0.5 centimeters in diameter. They form when there is friction or irritation to the skin, causing separation between the layers of the epidermis, which leads to the accumulation of fluid.

In the context of friction blisters, they arise from repetitive friction or pressure on an area of skin, leading to the formation of a larger fluid-filled sac. This distinguishes them from vesicles, which are smaller, usually less than 0.5 centimeters in size, and typically contain a clear fluid.

Other lesions like pustules involve pus, indicating infection or inflammation, while macules are flat and discolored patches of skin that do not contain fluid. Understanding the specific characteristics of these types of lesions is essential for accurately identifying skin conditions and determining appropriate treatment.