Which of the following is NOT considered a form of rash during a physical exam?

Blochmarks are not classified as a form of rash. In dermatological terms, a rash is typically characterized by changes in the color or texture of the skin that can include various lesions and eruptions.

Macules are flat, distinct, colored areas of skin that are not raised; they can represent different conditions. Urticaria, commonly known as hives, consists of raised, itchy welts on the skin, often resulting from allergic reactions. Vesicles are small, fluid-filled blisters on the skin that can occur due to infections or other skin conditions.

In contrast, Blochmarks refer to hypermelanic lesions resulting from the presence of melanin in the skin, typically related to genetic variations and are not associated with the inflammatory processes that characterize rash-like conditions. This distinction makes Blochmarks different from the other options listed, which are all types of rashes recognized during a physical exam.