estriaLas stretch marks plural Striae are atrophies skin in the form of winding of whitish or blue lines which, located in connective tissue, seen by transparency through the epidermis.They are preferably located in the wall of the belly, hips, buttocks, legs, thighs, arms, back and breasts. In reality, they are a pathological state of the connective tissue of the dermis, characterized by excessive fibrosis located in the form of strings in response to the breakdown and poor quality of the previously existing fibers. We can say that they are scars of this tissue.If stretch marks are formed, are Violet or purple, it tells us that the dermis has blood supply. If then they are pink, also have irrigation. When there is no blood supply are ( 41 medium orange; color.