If they look like uneven grooves and are shallow, then yes, they are stretch marks. Stretch marks are caused by rapid growth like that which occurs during puberty or pregnancy. The skin gets damaged a little by the sudden growth, which then causes these marks as a result.
Anyway, I included the little explanation to show that anyone can get them. You may be slim, but your body still grew in some way to get them. I have them on my hips and thighs yet I'm thin as well. It doesn't matter about any wear and tear from activity - only sudden growth, and the skin not being able to keep up with it.
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are they light white in colour then yes they are stretch marks. Stretch marks are usually gained when there is stretching of skin.
a long time? if you haven't always been slim I would say they are what you think they are
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yeh I'm pretty sure they are. its OK tho=] maybe if you bulk up more your skin will tighten a bit=]
Yea, could be due to weight loss or muscle growth
Yeah it could be because of rapid growth.
Sounds like it
yup
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