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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 (EPO) is a glycoprotein hormone produced by the interstitial fibroblasts in the kidney that signal for erythropoiesis in bone marrow. The increased activity of a Hemocytoblast (RBC stem cell) allows the blood to have a greater carrying capacity for oxygen.