They made a few 'cosmetic' [='superficial'] changes to the deal, but they didn't change anything of real importance.
She says she's never had/undergone 'cosmetic surgery'. [=surgery done to improve a person's appearance]
The house just needs some paint and a few other 'cosmetic' [='decorative'] changes.
(..) That's it. I'm leaving. So go ahead. Think about this, Lorraine! Who's going to pay for your clothes? And your jewelry and liquor? Who's going to pay for your cosmetic surgery? You were the one who wanted me to get these things. If you want them back, you can have them. BIFF: Look, Lorraine. (..)1989 Back to the Future Part II