Oregon Written Tattoo Practice Test

In dermatology, which lesions are classified as secondary lesions?

1. Vesicle and Bulla

2. Pustule and Fissure

3. Scale and Crust

4. All of the above

The correct answer is: Scale and Crust

Secondary lesions in dermatology are those that develop from primary lesions or as a result of changes in the skin that occur after the initial injury or eruption. They often represent the evolution of the condition due to processes such as healing, inflammation, or infection. Scale and crust fall under the category of secondary lesions. Scale refers to the flaking or shedding of the outer layer of skin, commonly seen in conditions like psoriasis or eczema, indicating a change in the skin's surface. Crust is the result of dried serum, blood, or pus on the skin's surface that forms after other lesions have developed, representing an advanced stage of healing or infection. In contrast, vesicles and bullae are considered primary lesions because they arise directly from an underlying skin condition, such as blistering. Similarly, pustules and fissures also originate from primary skin processes. Therefore, while vesicles, bullae, pustules, and fissures have their own significance in assessing skin lesions, they do not fall under the designation of secondary lesions. Understanding the distinction between primary and secondary lesions is essential for accurate diagnosis and treatment in dermatology.