Why Do Wounds Form Scabs?

Anyone who has experienced a cut, scrape or other open wound to the skin has also experienced a scab. It’s a good thing that scabs form on the wound site because they serve to protect the sensitive area from bacterial infection. This efficient covering also helps keep the sensitive tissue clean while it heals. Scabbing can also be seen as part of the blood-coagulation process that keeps us from losing excessive amounts of blood.

Medical personnel will quickly tell you not to try to remove a scab because it is an essential part of the healing process. Scabs serve a purpose similar to a band-aid or gauze covering that is put in place to protect the wounded area. This protective tissue will eventually fall off when the tissue underneath heals sufficiently. Taking them off early usually causes small amounts of additional bleeding and can extend the healing time. In addition, a second scab will have to form and the affected area will probably be larger than it was the first time.

You also risk opening the wound to infection that had been prevented by the original scab. This doesn’t happen as often as you might think, especially in healthy individuals. The body’s immune system is generally strong enough to prevent further problems if a scab is removed accidentally or intentionally.

Part of the answer to the question, “Why do wounds form scabs?” lies in determining “how” scabs actually form. The body’s cells send out a “call” for key reactions. Immune-system cells travel to the injured area to start battling harmful bacteria that could enter through the opening in the skin or other tissue. White blood cells are the body’s primary “attackers” when an injury occurs.

Human blood is composed of several parts, many of which become part of the healing process when an injury occurs. Solid parts of the blood, called platelets, begin the clotting process, essentially plugging the opening so that there is no major blood loss.

As this fight against harmful bacteria and toxic substances concludes the dead bacteria and “used up” cells start to form the scab. A specific protein known as fibrin is also present as one of the key elements in blood clotting. Platelets in the blood stick together during this process, helping to close the wounded area by building a scab.

The bottom line with wounds to the skin and to the tissue beneath the skin is that when a scab starts to form in a normal way you can pretty much forget about it. Of course, there will be times in the course of everyday living when this protective covering is knocked off or becomes loose. It’s important not to try and scratch the scabbed area because this may loosen the covering. Healing wounds can itch as the tissue repairs and the body’s immune system works to protect us from illness and infection. When trying to understand why scabs form and what their purpose is, it’s easiest just to think of this as the body’s natural covering for a sensitive area that is “under construction.”