we turn red when our blood vessel in our skin expand. This can occur after physical effort, or when it's hot, because it enables the body to lose heat. It also occurs if we are angry or in unpleasant or embarrassing situation, because stress hormones cause blood pressure to rise, which increase the blood supply to the skin, showing up particular on the face and neck. Blushing caused by embarrassment only last for a few second and is often barely noticeable. However, some people have a stronger reaction and for reasons that are still unclear, the increase blood flow continues for longer periods. Fear of blushing can make the problem even worse. This phenomenon which called ERYTHROPHOBIA can be treated by psychotherapy, relaxation therapy, medicine or a last resort, surgery.
huhu, i have a friend, even he not embarrassed but, his face always pink@red. huh.. we call him 'pink'!!