probably stretch marks or thread veins from your description - stretch marks you can get as you're growing in all sorts of ways (weight gain, puberty - sorry, don't know how old you are!). Thread veins tend to come with age and are a bit like a really minor version of varicose veins you'll see in some older peoples' legs.
Nae worries, they're not much of a problem. If they're really bothering you there are treatments available...
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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