Red face on Zoom
Recently a colleague noticed that my face showed up as unnaturally red-toned on Zoom. I checked preferences and there is no color tint control. I saw several other posts here complaining of the same issue. I think I've solved the issue.
In Zoom Preferences, click Video and turn on "Adjust for low light". Mine was set to manual and too far to the left, leaving Zoom to try to compensate by (for some reason) heightening the red tones. Set it to "Auto" and see if that fixes it. It did for me.
BTW, I had previously tried resetting the SMC (Reset the SMC of your Mac - Apple Support ) and NVRAM (Reset NVRAM on your Mac - Apple Support) based on a Community response regarding general video issues. These resets did not resolve the issue, but if the setting above doesn't work, you may want to try these as well.
iMac (2017 – 2020)