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Stretch marks commence as raised reddish lines on the skin. Turning purple they eventually fade into flat silver streaks. They are medically known as a stria. Stretch marks tend to occur when the skin is stretched a lot over a period of time, for example during pregnancy. The skin consists of three parts, the epidermis (outer layer), the dermis (middle layer), and the subcutaneous (inner layer), where fatty tissue is found. The dermis's job is to support the skin and keep it firm. The dermis also contains blood vessels which supply the skin cells nutrients and nerves which give us feeling. The dermis is where stretch marks occur. usa viagra pfizer viagra erythromycin when was viagra approved viagra buy online cheap online doctor viagra
