Any tips for preventing/stopping stretch marks?

Recently I’ve got red stretch marks on my upper arms and biceps. I haven’t really got stretch marks before besides when I had a growth spurt about 12 years ago.

I haven’t gained a significant amount of weight so not sure how they’ve occurred. Just wanted to know if there’s something I can do to reduce the appearance of these?

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Update: thanks for the suggestions and answers! I’m going to try to moisturise and not go too hard in the gym :)
Any tips for preventing/stopping stretch marks?
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