Crust or scab would be classified under which type of lesion?

Crust or scab is classified as a secondary lesion because it results from a primary lesion that has undergone a change. Primary lesions, such as blisters, macules, or papules, appear on the skin as the initial phase of a skin condition. When these primary lesions rupture or heal, they can leave behind a crust or scab as the body’s natural healing process takes place.

Secondary lesions reflect the changes and outcomes stemming from primary lesions, which is why crusts or scabs are categorized in this way. They signify an area of healing or protective response, often resulting from the body's efforts to repair damaged skin. This understanding is crucial for effective diagnosis and treatment in nail technology and broader skincare practices.