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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.
 Erythrocytes or red blood cells are formed in the bone marrow from precursor cells called erythroblasts which themselves are formed from pleuripotential stem cells-the m â¦ other of all blood cells. Along the way, erythroblasts take various forms/ stages until they differentiate into mature erythrocytes.