Stretch marks during pregnancy. Stretch marks, the common name for striae, are lines on the skin caused by thinning and loss of elasticity in the lower layer of skin (dermis). They often form as the area around swells - typically during adolescent growth spurts and pregnancy. They appear as red raised lines, later becoming the purple colour (seen here) and then finally fading to form shiny streaks. There is no effective means of prevention or cure.
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