The more one studies lichen planus the more one is struck by the multiplicity and variety of aspects that this disease may present. The clinical variations may range from hypertrophic to atrophic; the color, from red to white. Almost the entire body surface may be involved or only an isolated spot. Subjective symptoms may be severe, while in other cases extensive eruption may be present without even the slightest itching. In spite of all the clinical variations, there is a fairly constant microscopic picture.
Lichen planus erythematosus is a rare and unusual form of lichen planus. I shall report what I consider to be a classical example of this rare disease. My case corresponds clinically to the original descriptions given by Crocker, and the histologic examination reveals a pathology which has characteristics of the ordinary form of lichen and also some of the elements found in sections taken from atrophic