See this [comment](https://www.reddit.com/r/explainlikeimfive/comments/1mw52n/eli5_why_is_hair_growing_out_of_moles_thicker/) on an archived post:
> Moles are basically a tumor. The unusual cell cluster pushes on the follicle, making it grow hair faster than usual. (…)if your mole grows hair that’s a sign it’s not cancerous.
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