Which of the following is NOT classified as a primary lesion?

Primary lesions are defined as initial alterations in the skin that can occur before any secondary changes (such as scabs or scars) develop. They are the direct result of a pathological process and reflect conditions like inflammation or infection.

Macules, nodules, and pustules all fall under the category of primary lesions. Macules are flat, discolored spots on the skin, nodules are solid, raised bumps that can vary in depth, and pustules are small, elevated lesions filled with pus. These formations represent direct changes to the skin's structure or color resulting from various processes.

Excoriations, on the other hand, are not classified as primary lesions. They are considered secondary lesions because they represent alterations resulting from trauma to the skin, often due to scratching or abrasion. This distinction is important for understanding the progression of skin conditions and helps in diagnosing specific dermatological issues effectively. Understanding this classification aids in the appropriate treatment and management of various skin conditions.