Scar, Stretch Mark Reducers

Scars are areas of fibrous tissue that replace normal skin (or other tissue) after destruction of some of the dermis. A scar results from the biologic process of wound repair in the skin and other tissues of the body. Thus, scarring is a natural part of the healing process. more...

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With the exception of very minor lesions, every wound (e.g. after accident, disease, or surgery) results in some degree of scarring.

Scar tissue is not identical to the tissue which it replaces and is usually of inferior functional quality. For example, scars in the skin are less resistant to ultraviolet radiation, and sweat glands and hair follicles do not grow back within scar tissue. A Myocardial infarction, commonly known as a heart attack, causes scar formation in the heart muscle which leads to loss of muscular power and possibly heart failure. However, there are some tissues (e.g. bone) which can heal without any structural or functional deterioration, and in fact bone tissue may be structurally stronger after a break.

The word scar was derived from the Greek word eschara, meaning fireplace.

How scarring occurs

A scar is a natural part of the healing process. Skin scars occur when the deep, thick layer of skin (the dermis) is damaged. The worse the damage is, the worse the scar will be.

Most skin scars are flat, pale and leave a trace of the original injury which caused them. The redness that often follows an injury to the skin is not a scar, and is generally not permanent. The time it takes for it to go away may, however, range from a few days to, in some serious and rare cases, several years. Various treatments can speed up the process in serious cases.

Scars form differently based on the location of the injury on the body and the age of the person who was injured.

To mend the damage, the body has to lay down new collagen fibres (a naturally occurring protein which is produced by the body).

This process results in a fortuna scar. Because the body cannot re-build the tissue exactly as it was, the new scar tissue will have a different texture and quality than the surrounding normal tissue. An injury does not become a scar until the wound has completely healed.

Transforming Growth Factors (TGF) play a critical role in scar development and current research is investigating the manipulation of these TGFs for drug development to prevent scarring from the emergency (and rather inappropriate) adult wound healing process.

Abnormal Scars

Two types of scars are the result of the body overproducing collagen, which causes the scar to be raised above the surrounding skin. Hypertrophic scars take the form of a red raised lump on the skin, but do not grow beyond the boundaries of the original wound, and they often improve in appearance after a few years. Keloid scars are a more serious form of scarring, because they can carry on growing indefinitely into a large, tumorous (although benign) growth.

Read more at Wikipedia.org