Which condition is described as fluid-filled blisters?

Fluid-filled blisters are specifically referred to as bullae. These are larger elevation of the skin that contain clear fluid and can occur due to various conditions, including burns, infections, or friction. Bullae are differentiated from other skin lesions based on their size and fluid content; they are generally greater than 1 centimeter in diameter.

In contrast, petechiae are small, pinpoint red or purple spots caused by bleeding under the skin and do not involve fluid-filled structures. Erythema describes redness of the skin that can result from various causes, including inflammation and irritation, but it does not denote fluid accumulation. Pustules are small, raised lesions filled with pus, indicating infection or inflammation, but they do not involve clear fluid as bullae do. Thus, the identification of bullae as fluid-filled blisters is accurate and aligns with the definition in dermatological terms.