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Numbness and tingling are unusual prickling sensations that can happen in any part of your body. People generally notice these sensations in hands, feet, arms, and legs. Many things can cause numbness and tingling, including sitting with your legs...
Cyanosis is condition in which a person develops a bluish tint to the skin, fingernails, and fingertips. It's caused by not having enough oxygen in your blood and can occur suddenly or over time due to chronic illness.