What are these?

Ok so I’ll admit I’m not the healthiest eater and nor do I exercise much beyond walking a mile a day (in bursts at school) and my thighs are really large compared to my upper half of my body. What are these things on my thigh when I pull on my skin?? (White squiggly marks) just gonna blur as TMI since I don’t know if it qualifies or not so better safe than sorry.