Well, it is a weird question.
I can't say I have had the pleasure of this particular development. Lucky you! It does pose some interesting questions about how the nervous system works.
It reminds me of an account in The Brain that Changes Itself
(a good book), where a man has an itch on his right hand which he can't scratch, owing to the fact that his entire right arm was amputated years earlier. A doctor spent enough time with him to discover that certain parts of the brain that would ordinarily be involved with the right hand were now being used by his face. Lo and behold, if he scratched his cheek in a certain spot, it felt to him like he was scratching his phantom hand!
I haven't found anything definitive on itching and scratching specifically for the face, but it does seem that the nerve pathways used to send itch signals are different from the ones used for feeling. So it would appear to be possible to get an itching sensation, yet not feel the scratching. I'm going out on a limb and guessing that it suggests that the trigeminal nerve is intact, so at least it gives you hope for recovering from the numbness.
Can you put some Benadryl cream on it?