Numb/blue hands and face after marathons?

You just finished a marathon and your core temp was less than normal? In both the heat and the cool? 32 is also on the low side of normal. I would say talk to a doctor.

I have had the numbness/tingling in my hands only after hard races, but never any blueness, and it usually goes away within 10 -15 minutes, usually less. And def not a core temp that low, especially 2 hours after.

I say something funny going on.

Don't know for sure, but you could have Raynaud's Disease. Not a serious problem, but you have to take some precautions in certain conditions.

It could be a hydration issue. Symptoms of dehydration can resemble symptoms of blood loss. Your blood is 90+% water, and as you become dehydrated, your blood volume decreases. Your body will divert the blood flow to where it needs it most - toward your internal organs and away from extremities. This leads to cold hands, feet, face, etc., numbness/loss of coordination in extremities, and possibly other problems (dizziness, nausea).