Which skin condition is characterized as a small elevation containing fluid?

The skin condition characterized as a small elevation containing fluid is indeed a bulla. A bulla is defined as a large blister that can hold clear fluid or serum, and it is generally greater than 0.5 centimeters in diameter. It forms when there is a separation between the layers of the skin, allowing fluid to accumulate. Bullae can arise from various causes, including friction, burns, or underlying skin conditions.

In contrast, a pustule is a small elevation of the skin that typically contains pus, while a papule is a solid, small raised bump on the skin that does not contain fluid. A cyst, on the other hand, is a closed sac-like structure that can contain fluid, but it tends to be larger and more complex, often involving the epidermis and deeper layers of skin. Understanding these distinctions is crucial for identifying and treating various skin conditions properly in the field of cosmetology.