Various causes of stretch marks

In the previous entries, I have explained some of the causes of stretch marks. In this entry, I would like to share with you some info about causes of stretch marks based on some researched done previously by scientist.

While there remains a great deal of debate concerning the actual causes of stretch marks, researchers do know that they are more common during pregnancy, periods of rapid growth such as during early adolescence, rapid weight gain or obesity, hormonal fluctuations and periods of intense body building and exercise. The most common areas of the body affected by stretch marks are along the torso, were multi-dimensional growht is common, including the hips, breasts, buttocks, thighs and abdomen.

The actual appearance of stretch marks changes with time. When first formed, stretch marks will appear to be red or perhaps even a dark shade of purple. If treatment is administered during this initial phase, the chances are much better for the stretch marks to diminish and fade. However, in time and irrespective of treatment, the stretch marks will become white or hypo-pigmented and remain so for the rest of a person’s life.

There are many theories about what actually causes stretch marks, but researchers have yet to identify anything conclusive. It is known that the collagen and elastin fiber network supporting the skin becomes stretched — perhaps due to a weakness in these underlying structures caused by some genetic factor. It is known that stretch mark does seem to have a genetic link, but researchers have yet to identify any specific gene that would lead to a weakening of the collagen and elastin fiber network.

Researchers have recently started concentrating on a possible hormonal link to stretch marks. Glucocorticoids are secreted by the adrenal glands and their production is substantially increased during pregnancy, adolescence, obesity and weight lifting. The increased glucocorticoid production just happens to coincide with times when the appearance of stretch marks is most likely, which is why researchers are now investigating this possible link. Recently, research has determined that the glucocorticoids can and do prevent the fibroblasts from repairing and regenerating the collagen and elastin fiber network. However, it is not known whether this hormone actually causes the stretch marks or merely makes their appearance more likely, given their role in controlling fibroblast activity.

Another theory about the cause of stretch marks centers around how the process of stretching itself may be affecting the melanin (responsible for skin pigment and protecting the skin against UV sun radiation). It is believed that when the dermal collagen becomes damaged during stretching, blood vessel dilation occurs. This dilation will help form the red or purple “early” stretch marks. This occurs, in theory, because the inflammation and collagen remodeling cause the loss of pigment-producing melanocyte cells or simply obscure the pigment altogether.”
Source of Article: www.dermstore.com/articles/article_105.htm

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