The blue tint occurs when the concentration of deoxygenated (reduced) hemoglobin in the blood exceeds approximately in the superficial capillaries. Cyanosis (Blue Hands & Feet): Causes, Treatment & Diagnosis

Cyanosis is a clinical finding characterized by a bluish, purplish, or grayish discoloration of the skin, nail beds, or mucous membranes . It is a sign of an underlying medical issue—typically related to low oxygen levels in the blood or poor circulation—rather than a disease itself. Pathophysiology

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