It began when Kylie did Kendall's makeup one time in November, 2016.
"All of a sudden, photos of us came out with headlines like, 'OMG Kendall got her lips done and got full facial reconstruction — look at her cheekbones, look at her nose,'" she said of the aftermath. "Kylie saw it all unfold and felt bad, so she went on Snapchat and took the blame. It’s all so exhausting. As a model, why would I have my face reconstructed? It doesn’t even make sense."
However, a new video of makeup artist Hung Vanngo doing Kendall's makeup has come out making fans insist that she got lip injections, and is just not admitting it.
Kendall has been pretty adamant on the fact that her face is ~au naturale~, so it really could just be lip liner... however it's also possible that she just isn't comfortable admitting it at this time.
Each to their own!