Oregon Esthetician State Board

What is a bulla?

1. A small elevated lesion filled with clear fluid

2. A large blister containing watery fluid

3. An abnormal growth of the skin

4. A type of lesion with pus

The correct answer is: A large blister containing watery fluid

A bulla is defined as a large blister that is filled with watery fluid, which distinguishes it from smaller lesions. Generally, a bulla is more than 0.5 centimeters in diameter and can develop as a result of various conditions, including friction, burns, insect bites, or certain skin diseases. Understanding the characteristics of a bulla is important for estheticians, as it helps in correctly identifying skin conditions and determining appropriate treatment methods. Bulla can also indicate underlying health issues that may need to be addressed. In contrast, the other options describe different types of lesions. For example, a small elevated lesion filled with clear fluid refers to a vesicle, while an abnormal growth of the skin could refer to a tumor or cyst. Lastly, a type of lesion with pus indicates an infected site, often described as a pustule. Each of these lesions has distinct characteristics and implications for skin care and treatment.