Stretch marks occur during the last few months of pregnancy in up to 90 percent of women. Those shiny pink or purple lightning bolts on your hips, stomach, breasts and thighs aren't temporary blemishes, either. They're actually scars called striae distensae that are the result of hormonal changes and rapid weight gain. They have a hereditary component, too, so if your mother has them, you'll probably have to deal with a few as well. Over time, stretch marks may fade to silvery white lines that will only be noticeable when you're out on a sunny day in your low-rise jeans and tube top -- or your teeny bikini. (Let's not think about that right now.) There are ways to take a proactive approach to stretch marks. From a tummy tuck that will actually remove the affected skin, to dermabrasion and laser treatments, stretch marks don't have to be forever if you're determined to eradicate them. There are also creams you can use to moisturize your skin during and after your pregnancy to keep it supple and stretchy.