system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do hairs that grow from skin blemishes, like moles, grow faster, thicker, and darker?
gpt
Moles are basically cells with a lot more melanin, in addition to their structural differences (being raised off the skin). Melanin is what makes your skin dark. The hairs themselves just have more melanin, and thus appear darker/thicker.