Having stretch marks is probably any woman's worst nightmare. But what really causes these ugly marks to appear? One of the main reasons for stretch marks in females is pregnancy. As the baby grows inside you, he will need more room to develop. Your stomach stretches out to make room for the baby and once the skin in your belly has reached its maximum elasticity, striations to appear. Stretch marks are actually scars caused by the skin losing its elasticity. Other reasons for stretch marks in...