Cyanosis: The characteristic blue color of the skin observed when the amount of unoxygenated hemoglobin in the blood rises above 5g per 100ml of blood.

Macrophages: Any of the large phagocytic cells of the reticuloendothelial system.

Necrosis: Disease of the tissue in which it gradually turns gangrenous due to some organisms known in the media as "flesh-eating bacteria."

Phagocytosis: The engulfing and ingestion of bacteria or other foreign bodies by phagocytes.

Septicemia: A systemic disease caused by pathogenic organisms or their toxins in the bloodstream. Also called blood poisoning.

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