Historical reference: Do not rely on this information. It is very old. About this collection
Erythema, a skin disease in which diffuse redness of the cutaneous surface occurs. The term is very loosely applied. Erythema often occurs in rheumatic subjects. A well-marked form of erythema is Erythema nodosum, in which affection exceedingly painful, reddened, and raised patches are noticeable, usually involving the skin of the leg over the shin bone.