It is analogous to the geological formation, the plateau. A wheal is an area of edema in the upper epidermis. Telangiectasia are the permanent dilatation of superficial blood vessels in the skin and may occur as isolated phenomena or as part of a generalized disorder, such as ataxia telangiectasia. Secondary lesions may evolve from primary lesions, or may be caused by external forces such as scratching, trauma, infection, or the healing process. The distinction between a primary and secondary lesion is not always clear.
Desquamation occurs when there are peeling sheets of scale following acute injury to the skin.
Please remember that crusting is different from scaling. The two terms refer to different phenomena and are not interchangeable. One can usually be distinguished from the other by appearance alone. It is usually due to chronic rubbing or scratching of an area. A fissure is linear cleavage of skin which extends into the dermis.