Which of the following skin lesions is NOT considered a primary lesion?

Scales are classified as secondary lesions rather than primary lesions. Primary lesions, such as pustules, macules, and wheals, are the initial manifestations of a skin condition. They are directly related to changes in the skin's structure. For example, pustules are small elevations filled with pus, macules are flat and discolored areas on the skin, and wheals are raised, red areas often associated with allergic reactions or insect bites.

Secondary lesions, like scales, result from the progression of a primary lesion or from the drying out of lesions, often presenting as flakes or plates on the skin surface. Understanding this distinction between primary and secondary lesions is vital in dermatology, as it helps in diagnosing various skin conditions and determining treatment approaches.