Re: custom content eyebrows, but I never download CC
@PerfectPlumbobs I've moved your post to the Sims 4 PC tech section.
The simplest way to tell if you have cc is to remove your entire Sims 4 game folder from Documents\Electronic Arts. (You can just put it on your desktop.) Launch the game, start a new save, and see whether the eyebrows are still present in CAS. If they are, even in a clean game folder, then they're EA content, since the clean folder wouldn't have any other added files.
Don't worry about your saves or builds; they'll be in your old game folder. Once you've tested, you can trash the new folder and put the old one back, and everything will be back in your game again.
If you want confirmation from someone else though, you can always take a screenshot of the eyebrows in CAS and attach it to a post here. Then other players will be able to compare it to their own games.