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As in the title, for example, something that makes you able to enter CAS through mirrors, not just edit hair; or a beauty salon where you can change skin tone and facial appearance etc.
If you have Generations (I think) your Sim can get plastic surgery but I don't think you can change their skintone. I don't use Generations a lot, so I can't remember off the top of my head.
And I'm sure you don't want to go the cheating route-for whatever reason-but you are aware that the built-in TestingCheatsEnabled true cheat allows you to do this by right clicking on the offending Sim? There is no need for external mods to do that.