What's going on here?

@simgirl542

Do you by chance play with custom content or mods if you do, you might consider going through them to see if something is interfering with your game.

I've come across this recently in my current game where I was using cc skin and my sim ended up with it. I quickly remedied that with taking that cc skin out of my game.

To fix mods and custom content try the 50/50 method:

1. Move all the mods and cc out into a temporary folder on the desktop.
2. Move a few files back at a time. Load the game to make sure it loads and everything is good.
3. Delete the localthumbcache.package from the Sims 4 folder.
4. Repeat steps 1 - 3 till there is no more files to check.

** While your testing, don't save the game. If you find any problems, delete the mod or custom content file.

How To Find Problem Mods and CC -http://simswiki.info/wiki.php?title=Game_Help:TS4_Finding_Problem_Custom_Content

I just use MC Command Center, but this was also occurring before I first installed it over a year ago.

@simgirl542
MC does not cause such deformations. If you do not have CC clothes or skins, then the game caused this deformation. You can try to fix the game on Origin, but of course it will not reverse these changes. I assume you're using Story Progression, and I've discovered that when you play for a long time and the fourth generation of sims is already grown up, some sims really need a correction because they look terrible.
But if you have MC, you can easily improve the appearance of your sims. I always correct it.

In addition, you can set the MC to let children inherit only the appearance of their parents

Easy fix: Don't starve your sims xD