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Redness of the skin caused by dilatation and congestion of the capillaries, often a sign of inflammation or infection.

[Greek eruthēma, from eruthainein, to redden, be red, from eruthros, red; see reudh- in Indo-European roots.]

er′y·them′a·tous (-thĕm′ə-təs, -thē′mə-), er′y·the·mat′ic (-măt′ĭk), er′y·the′mic adj.
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Adj.1.erythematous - relating to or characterized by erythema
References in periodicals archive ?
The Sweet syndrome, also known as acute febrile neutrophilic dermatosis, is a rare condition characterized by an abrupt onset of pyrexia, an elevated neutrophil count, tender erythematous skin lesions, and a diffuse infiltrate of mature neutrophils in the reticular dermis with edema in the papillary dermis.
The face is usually spared, although the cheeks may be erythematous with pallor around the mouth.
On day 17 of PIP/TAZ therapy, while fever and neutropenia were still persisting, an ulcerated erythematous lesion with a necrotic center was detected on the patient's right hip, and there were smaller acneiform, erythematous nodular lesions on the left side of the abdominal wall, the left hip, the forearm, and the axilla (Figures 1 and 2).