Weird white flakes in legs of pants?

Weird white flakes in legs of pants?

Weird white flakes in legs of pants?

Whenever I take my pants off I see these weird white flakes in the legs of the pants. They seem to be skin, they also come off of me when I rub my leg. Is this normal? Does this happen to everyone? Or is this some kinda skin problem?

Weird white flakes in legs of pants?
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