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.