What is the bluish coloration of skin due to the presence of deoxygenated blood called?

The bluish coloration of the skin resulting from the presence of deoxygenated blood is termed cyanosis. This condition occurs when there is insufficient oxygen in the blood, often making the skin, especially around the lips and extremities, appear bluish due to the visibility of the darker deoxygenated hemoglobin. Cyanosis can indicate various health issues, including respiratory or cardiac problems, where effective oxygenation is compromised.

Jaundice refers to a yellowing of the skin and eyes, associated with an excess of bilirubin in the blood, which is different from the bluish hue seen in cyanosis. Erythema describes redness of the skin caused by increased blood flow or inflammation, while chloasma, often related to hormonal changes, manifests as brown patches on the skin. Understanding these terms helps to identify different skin conditions and their underlying causes.