Health and Fitness (Q&A)

Answer:

A scab is a hard coating which is formed on a wounded skin. Whenever we get injured with a wound, blood platelets immediately pack themselves together in the wound itself and form a plug which is popularly known as a blood clot. This clot prevents or reduce further blood loss. But this clot cannot hold on for long. So more platelets collect around the wound and a new substance called fibrin is produced. This fibrin builds a covering over the wound. This combination of platelets, fibrin and plasma creates scabs. Scabs function as protective caps over the wound that prevent dirt, germs and other contaminants to enter the wounded part. As the blood platelets dry out, the scabs usually take on a deep, rusty brown colour and develop crusty edges. Scabs generally remain firmly in place until the skin underneath has been repaired and new skin cells have appeared. If scabs are prematurely removed, the revealed skin may look red and oozing. New scabs may reform, but often the new skin develops scar tissue.

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