22, haven't had any rapid weight loss recently. Why am I developing stretch marks now? What can I do?

I have a lot of silver stretch marks I noticed after losing weight years ago. I'm not a teenaget as well (22). I noticed a red stretch mark on the side of my breasts. Why am I getting new stretch marks now? What does this mean? I do mild exercises and havent had any rapid weight loss recently. Suggest a treatment too. Thanks.

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