system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why is some skin (like a bald head) very shiny while most skin (even when oily) is comparably matte?
gpt
Shiny usually means smooth (note that the reverse isnt always true). 

Skin most places is rough because of pores, hairs, wrinkles, fingerprints, etc, so its matte, whereas skin on the scalp is pretty much just skin over bone, so its shinier. You'll notice older bald people dont have as shiny scalps.