I've only been working out for two weeks, why do I have stretchmarks on my arms already?

wwwwwwxyz
I was (and still am) pretty skinny and I decided to start working out a bit and already I have some bright red stretchmarks on my arms. I tried to get a pic of them, but my camera is so garbage that you can't even see them. I just wanna know, why after two weeks of working out, I already have stretchmarks.
(not me, but exactly what my body looked like before)
(not me, but exactly what my body looked like before)
Me now (still pretty skinny)
Me now (still pretty skinny)
I've only been working out for two weeks, why do I have stretchmarks on my arms already?
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