Primary lesions are described as being

Primary lesions are characteristics of skin changes that occur as a direct result of a disease process. When describing primary lesions, they are typically marked by a difference in color and/or elevation compared to the surrounding skin. This includes a variety of forms such as macules (flat, colored spots), papules (small, raised bumps), and plaques (large, flat areas). These variations are essential for identifying and diagnosing skin conditions.

The presence of color differences and elevation signifies that the lesion is an initial response to irritation, infection, or other dermatological issues, which is fundamental in the field of cosmetology and particularly relevant for nail technicians who must recognize skin abnormalities around the nail area. Recognizing primary lesions accurately enables nail technicians to provide proper care and treatment or to refer clients to appropriate medical professionals when necessary.

The other options focus on characteristics that do not comprehensively define primary lesions, such as being colorless and flat, being only scaly, or being limited to mucous membranes, which are not representative of the broader category of primary lesions that can occur on the skin.