What purpose does a scab serve?

Answer 1

A scab on the human body is a collection of partly dried red blood cells and mostly white blood cells. the white blood cells form on the outer layer of the skin to prevent future bleeding/stop the bleeding, and the living white blood cells on the inside of your body begin forming around the wound, repairing skin and flesh structure. All-in-all, a scab is the 'during' process of healing a wound.