Why would after excersize or any cardio cause the right side of your face to be red and sweaty and the left side normal ?

Left side not normal: Do you also have a slight eyelid droop on left side and pupil a bit smaller? If so, you may have horner's syndrome which can cause decrease sweating on that side, hence no sweat when u exercise and your r sweating/red as a nornmal physiologic response. So, the left side is abnormal. If this is so for you, consult doc for an evaluation--it is quite common. Good luck.