Erythema

The term erythema, used by itself, is the name of a symptom, not of a disease, and may be applied to any red­dened or congested surface not accompanied with eleva­tion, and may be produced by a variety of causes. There are, however, two well-marked affections, erythema multiforme and erythema nodosum, which are distinct morbid entities, and deserve careful consideration.