Hi MeowScha,
As you may know, numbness and tingling are common symptoms of MS. Where you might feel the numbness/tingling depends upon where the nerve damage is located in the CNS. The lips would be connected to cranial nerves.
Please know that tingling/numbness might also be caused by other conditions or might be a side-effect of medication. Call your doctor when you start to experience something new and unusual.
In answer to your question, have I experienced this? I've had numbness/tingling in my face but not my lips.
Best of luck,
Lisa