Why do I hold stretch grades on my backbone?

I'm a 16 year old boy and I own stretch marks on my posterior. Why do I have them? And how could I receive rid of them?Why do I hold stretch grades on my backbone?
Stretch marks are a sign of growth or weightiness gain which stretched the skin faster than it could adapt and grow to accommodate. If you grew taller speedily, you can get sideways stretch grades on your back. Pregnant women normally get them on their bellies, and girls may own them above their butts or on their breasts if puberty's changes be fast. Obese ethnic group have them, too.
There are lots of products which claim to minimize or prevent them, but none proven to work.
You'll find that if the stretch results are reddish or purple-ish, they will fade within a couple of years once growth is completed. A light sunburn may minimize their appearance, a medium or misty tan accentuate them (since the stretched skin doesn't suntan at the same rate).
those can get stretch results anywhere, somewhere on our body we all hold them! try Bio-oil from Boots (if u live in the UK)