When you go to a doctor, it would be a good idea to get B12, Vit D and zinc tested.

Vit D when very low can cause tingling. When tingling hits the face, it strongly suggests low calcium (hence low Vit D).

Doctors however are very likely to diagnose tingling in the face as
anxiety (psychosomatic)..so prepare for that one.

Keep a journal too, and see if there are food triggers. Gluten is one food (wheat, rye, barley) that can cause nerve issues.

If tingling goes away after you eat, then that suggests some blood glucose problem...lows will cause paresthesias in some people.

Low magnesium also will cause problems, but testing for this is spotty and only reliable when very very low or very very high. The midrange called "normal" is not really normal and may be too low for some and not others.

There is a lotion now with magnesium in it, you can try on your legs... Morton Epsom Lotion. This is very nice and helps alot of those with marginal or mildly low magnesium levels. WalMart carries it and so does Amazon online. It is still rather new and not in all stores yet. You don't need to slather this on, but only use about a quarter's diameter on each leg once a day. Do not apply on broken skin or sores.