Causes of Acne Scars :

Causes of Acne Scars :
In the simplest terms, scars form at the site of an injury to tissue. They are the visible reminders of injury and tissue repair. In the case of acne, the injury is caused by the body’s inflammatory response to sebum, bacteria and dead cells in the plugged sebaceous follicle. Two types of true scars exist, as discussed later: (1) depressed areas such as ice-pick scars, and (2) raised thickened tissue such as keloids. When tissue suffers an injury, the body rushes its repair kit to the injury site. Among the elements of the repair kit are white blood cells and an array of inflammatory molecules that have the task of repairing tissue and fighting infection. However, when their job is done they may leave a somewhat messy repair site in the form of fibrous scar tissue, or eroded tissue. White blood cells and inflammatory molecules may remain at the site of an active acne lesion for days or even weeks. In people who are susceptible to scarring, the result may be an acne scar. The occurrence and incidence of scarring is still not well understood, however. There is considerable variation in scarring between one person and another, indicating that some people are more prone to scarring than others. Scarring frequently results from severe inflammatory nodulocystic acne that occurs deep in the skin. But, scarring also may arise from more superficial inflamed lesions. Nodulocystic acne that is most likely to result in scars is seen in these photos:

(Photos used with permission of the American Academy of Dermatology
National Library of Dermatologic Teaching Slides)

The life history of scars also is not well understood. Some people bear their acne scars for a lifetime with little change in the scars, but in other people the skin undergoes some degree of remodeling and acne scars diminish in size. People also have differing feelings about acne scars. Scars of more or less the same size that may be psychologically distressing to one person may be accepted by another person as "not too bad." The person who is distressed by scars is more likely to seek treatment to moderate or remove the scars. Prevention of Acne Scars
As discussed in the previous section on Causes of Acne Scars, the occurrence of scarring is different in different people. It is difficult to predict who will scar, how extensive or deep scars will be, and how long scars will persist. It is also difficult to predict how successfully scars can be prevented by effective acne treatment. Nevertheless, the only sure method of preventing or limiting the extent of scars is to treat acne early in its course, and as long as necessary. The more that inflammation can be prevented or moderated, the more likely it is that scars can be prevented. (Click on Acne Treatments for more information about treatment of mild, moderate and severe acne). Any person with acne who has a known tendency to scar should be under the care of a dermatologist. (Click on Find a Dermatologist to locate a dermatologist in your geographic area).

article from www.skincarephysicians.com/acnenet/scarring.html