Peripheral cyanosis is a condition characterized by a bluish discoloration of the skin, particularly in the extremities such as the fingers and toes. This occurs when there is a decrease in oxygenated blood flow to these areas, often due to factors like cold temperatures, poor circulation, or certain medical conditions. The bluish tint is caused by an increase in deoxygenated hemoglobin in the blood vessels near the skin's surface. While peripheral cyanosis itself is not a disease, it can be a sign of underlying issues, such as heart disease, lung disorders, or shock, and may require medical evaluation.