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What are scabs made of?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
The key players in scabs are cells in the blood called platelets. When your skin is cut or scraped, you bleed. As blood is exposed to air, platelets rush to the scene and begin sticking together. They work with proteins called fibrin and other substances to form a scab, which is basically a blood clot on the skin.

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