Dr. Rynne, Male, 62 years old, white, great shape.  I have had this happen 2-3 times in the past 4 months.  Temporary numbness inside on my lip.  It might be a spot the size of a quarter, or it has been, say, an inch across.  Numbness last from 30 minutes to I think early this morning was 2 hours (I was groggy at 3:30am).  I am thinking that potentially it might be from green pecans?  I purchased a bag of pecans from Costco and from time to time would munch on a few.  I noticed numbness maybe 30 minutes later when walking.  I had leftover stuffing last night that did have pecans in it but my wife had toasted those pecans.  That symptom showed up 7 hours later.  I will typically have 6-7 pecans mixed up in a shake that I have in the morning but have not noticed issues from that.
Hi. Thanks for the query. The symptoms can be due to allergy while can be due to cause like nerve damage or injury, or other neurological causes. Nuts can cause allergic reaction as it is one of the common allergen and can be related to many other allergens. As it is recurring, so my suggestion is to consult an Oral Physician and get evaluated. It should be done especially when the numbness is present. Further investigations and management can be done once the cause is confirmed. Hope this helps. Regards.