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Erythema (from the Greek erythros, meaning red) is redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology include nervous blushes.
Erythropoietin is an endogenous hormone that stimulates erythropoiesis. Forms of recombinant human erythropoietin (rHuEpo) are also erythropoiesis-stimulating agents, and are mostly called epoetin; for example, epoetin alfa and beta are different isoforms of erythropoietin and the main differences in their actions arise from differences in glycation (60 E).