Wound, Ostomy and Continence Nurses Society (WOCN) Practice Exam

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What is a bulla?

Loss of superficial skin layer
Serous fluid trapped under skin less than 0.5cm in diameter
Flat spot of color change greater than 0.5cm in diameter
Serous fluid trapped under skin greater than 0.5cm in diameter

The correct answer is: Serous fluid trapped under skin greater than 0.5cm in diameter

A bulla is defined as a large fluid-filled blister that is greater than 0.5 cm in diameter. This type of lesion can contain serous (clear) fluid, and it may form as a result of various conditions, such as burns, friction, or infections. The characteristics of a bulla are crucial because they help differentiate it from other types of lesions, such as vesicles, which are smaller and also contain fluid. The key aspect that makes the definition of a bulla distinctly correct is the size criterion: it specifically exceeds 0.5 cm in diameter. This size distinction is important in clinical practice, as it plays a role in identifying various dermatological conditions and assessing their severity. Understanding this terminology is essential for healthcare professionals, especially those in wound and skin care roles, as it aids in accurate documentation and communication about patient conditions.