If you gained stretch marks due to weight gain, you won't lose them just by losing weight. It's as if you overstretched a rubber band, it won't go back to how it was originally. Most of time stretch marks just need time to fade away.
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Another easy way to gain stretch marks is by doing intense workouts as when muscles grow too quickly, they'll also cause stretch marks.
It also doesn't matter how skinny you are, no one is immune to stretch marks.