Returning stretch marks!

Mackenzie
Hi girls! I'm 16 going on 17, and when I was about 14 I had purple stretch marks all over my butt and boobs. They've long since faded to being pretty much invisible, but the past month or so the ones on my boobs have gotten a little purple again! Could it be that I'm growing again? I've definitely noticed my shape changing the past little bit but I didn't think my boobs were still growing!