What makes up of a scab?

A scab is primarily composed of dried blood, serum, and cells that form during the healing process after a skin injury. When a wound occurs, platelets and clotting factors in the blood work together to form a clot, which then dries and hardens, creating the scab. This protective layer helps to prevent infection and supports the underlying tissue as it heals. Over time, the scab will eventually fall off as new skin forms beneath it.