This patch removes only one color from the Highmate xenotype.
I've made a separate mod for each color so you can chose the combination you want.
Or you can just use them all together to make Highmates have normal human skin colors.
Other options:
No white:
https://steamcommunity.com/sharedfiles/filedetails/?id=3603484746
No Purple:
https://steamcommunity.com/sharedfiles/filedetails/?id=3603484456