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If someone nearly drowns, their body may not be able to get enough oxygen due to the lack of air. This can lead to a condition called hypoxia, where the body's tissues and organs are not getting enough oxygen. Without oxygen, the tissues and organs cannot function properly, and the skin may turn blue, a condition called cyanosis.
Cyanosis occurs when there is a high concentration of deoxygenated blood in the small blood vessels near the skin surface, giving the skin a bluish tint. This happens because hemoglobin, the protein that carries oxygen in the blood, changes color when it is not bound to oxygen. When there is not enough oxygen in the blood, the hemoglobin changes color and appears bluish.
