Stretch marks or "striae" as they are called in dermatology, are a form of scarring caused by a tearing of the dermis. They appear as striated, pink or reddish streaks. They affect both men and woman and usually develop during adolescent growth, weight training, weight gain/loss, and during pregnancy. RioBlush's CO2 Therapy dramatically improves the appearance of stretch marks. The technique consists of injecting very small amounts of medical grade CO2 gas directly into the dermis of the stretch mark to promote increased blood flow, collagen resynthesis and increased pigmentation.