Why was Tom Coughlin's face red today?

Answer 1

Temperatures for the game were at -3 F and wind chills were below -20 F. According to the Mayo Clinic, it is possible to have an allergic reaction to cold temperatures.

Rosacea sufferers also are prone to flare ups in extremely cold temperatures.

Further, it's fairly common for football players and other athletes to apply Vaseline to their skin to prevent frostbite.

As the Vaseline will prevent oxygen from getting to the skin, it may have exacerbated Coughlin's redness. The evidence for this is that Coughlin had a "beaver" appearance, with white skin around his eyes, where he wouldn't have applied the Vaseline.