When does Becker Nevus stop developing?

Hi there, I have a Becker nevus on my right shoulder and back. The back is darker but the front has more hairgrowth. I’m now 21, I think the mark has stayed the same for the last couple of years but I’m not entirely sure.
Has anyone’s mark grown larger or darker after puberty? I know it gets darker when exposed to UV light, but I hope it doesn’t expand on it’s own.

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Hi, I’m 18 now and have a Becker nevus on the left side of my back. I have the same question. I do hope it won’t grow larger after puberty but I have no idea about it. I tried not to think about it, but it’s too hard to ignore this trouble.

It really bothers me a lot.

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