Numbness didn't appear until 1 week after wisdom teeth extraction. Should I be concerned?

I had all 4 wisdom teeth removed a week ago. I had some numbness the rest of that day but it was gone by the following day. Yesterday morning (day 7) I woke up and the numbness of my lower lip and chin had returned, and has gotten worse in the last 24 hours or so. I know paresthesia is common with this procedure and can take weeks or months to subside. If the nerve was bruised or damaged, why would I have complete feeling for a week and then suddenly complete numbness? Thanks for your time.

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