Which among is not a primary skin lesion of:
**Core Concept**
A primary skin lesion is a change in the skin that occurs as a direct result of a disease process. Primary lesions are classified into five main types: macule, papule, nodule, plaque, and vesicle.
**Why the Correct Answer is Right**
Primary skin lesions are formed by the direct action of a disease process on the skin, and they do not undergo any changes due to secondary processes such as scratching or infection. **Option C**, a scratch or abrasion, is not a primary skin lesion because it is a result of an external factor (scratching) that alters the skin's surface.
**Why Each Wrong Option is Incorrect**
* **Option A:** Not specified, but typically primary skin lesions are not described as 'inflammation'.
* **Option B:** Not specified, but typically primary skin lesions are not described as 'infected'.
* **Option C:** As explained, scratch or abrasion is a result of an external factor altering the skin's surface.
* **Option D:** Not specified, but typically primary skin lesions are not described as 'secondary'.
**Clinical Pearl / High-Yield Fact**
Always remember that primary skin lesions are a direct result of the disease process, whereas secondary changes occur due to external factors.
**Correct Answer:** C. scratch or abrasion.