Definition of erythematous
: exhibiting abnormal redness of the skin or mucous membranes due to the accumulation of blood in dilated capillaries (as in inflammation) : relating to or marked by erythema an erythematous rash Skin examination revealed multiple discrete, erythematous, scaly, indurated papules on the lower back and buttocks, areas which had not previously been affected.— Jashin J. Wu et al.
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