Don't ever fix your lips like collagen
And say something when you gon' end up apologing!

from Kanye West – Can't Tell Me Nothing Lyrics on Rap Genius

Throughout the song, Kanye has been intertwining a nice parallel between the hypocrisy of poor ghetto culture, and his own hypocrisy. He is always saying things he ends up regretting, so he is talking about his own faults too

Collagen injections are used for cosmetic lip surgery

Note that Kanye is over-emphasizing words (and even making ones up (apologing)) to get his desired rhyme scheme, relating the two lines above.

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