NCIt definition : An autoimmune condition characterized by red, well-delineated plaques with silvery
scales that are usually on the extensor surfaces and scalp. They can occasionally
present with these manifestations: pustules; erythema and scaling in intertriginous
areas, and erythroderma, that are often distributed on extensor surfaces and scalp.;
Alternative definition : NCI-GLOSS: A chronic disease of the skin marked by red patches covered with white
scales.;