Why does his face turn red when he sees me?

[Anonymous]

When this guy spots me on the odd occasion, his face turns red. What does that mean?

[James-DL]

Red face means a rush of blood, biologically speaking. Movement in blood could be interpreted in many different ways. Sometimes fear causes movement of blood towards the feet and arms for basic fight/flight responses. Sometimes anger does the same. And I don't think I need to tell you where the blood rushes off to if the person is aroused.
In short there is no one emotion associated with redness.
I believe you have 2 options ahead of you:
A. Read some of Paul Ekman's books about facial expression recognition. He's a behavioral psychologist, super interesting all about reading people's emotions off their body. He proved Darwin's theory of universal emotion. Consults for the FBI sometimes. Great dude, great books.

B. You clearly think this guy is into you based on the question. Go ask him out if you're into him.

In the past I've picked the former and although I'm in a happy relationship now that is all down to my amazing girlfriend.
Good luck!

[elizabeth-jen]

from personal experience, all the people i know who have read those Ekman books are pseudo-sociopaths who are insecure about their lack of ability to naturally interpret human emotion. did they really help you figure out your girlfriend was into you? and if so why not ask her out? i guess all the knowledge of the FBI can't overcome the power of human nature's internalized self doubt. you seem cool though, good answer.

[NicolaD]

He’s dazzled by you but probably feels too shy in your company

[luvstoned4him]

He is blushing

he is shy

[DECENTSCOTTISHLAD999]

He likes you his heart is beating so fast as well

[Anonymous]

Rage.