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Good evening! You did spell lichen planus correctly! And I agree with you, I don't think it's related.
The symptoms you are describing mean that something has reversibly irritated the nerve that is inside your lower jaw. It can be a tooth infection that touches the nerve, a pinching of the nerve somewhere further back where it comes out of your skull, a variety of things. Are you have any other symptoms in your head and/or neck? Even if you think they may be unrelated . . .
This is Dr. David
I am a medical doctor
thanks for your question
you should see a doctor about this, but you can make a routine next available appointment.
it doesn't sound like your symptoms are related to your teeth since you have no tooth pains.
sometimes inflammation of your trigeminal nerve can cause these numbness symptoms.
sometimes inflammation of your TMJ joint from grinding your teeth could cause it
you may benefit from a brain MRI scan to look at your skull base and trigeminal nerve
let me know if you have questions.