What is a large blister containing a watery fluid called?

A large blister filled with a watery fluid is referred to as a bulla. This term is used in dermatology to specify a type of skin lesion characterized by its size (greater than 0.5 cm in diameter) and its contents, which are typically serous fluid, giving it a luminescent quality. Recognizing skin conditions and the appropriate terminology is crucial in the field of cosmetology and esthetics, as it allows for better communication regarding skin health and any potential issues that may arise during treatments.

The other terms represent different skin conditions: a papule is a small, raised bump on the skin, usually less than 0.5 cm in diameter; a cyst is a closed sac that is typically filled with fluid, but it is not classified primarily by its size and is often deeper in the skin; and a macule is a flat, distinct, colored area of skin that is smaller than 1 cm and does not involve any change in the texture or thickness of the skin. Understanding these distinctions is important for identifying and discussing different dermatological conditions in a professional setting.