I am having this problem too, humanoid alien races seems to change the extremes of the skin colors, sometimes resulting in weird colors also.

It also interferes with changing their skin colors using Facial Stuff mod

same here.

Comparsion: https://imgur.com/a/sPIhBOS

yeah same as me:

https://imgur.com/a/4DaurUQ

Samesies

same

Yup still getting it

Same here, gotta disable this mod until whatever is causing the issue is fixed.

All my pawns are turning vampire pale also, not using any other mods

Yeah, for me it's black folks turning white and white folks turning black. Not a big deal but kinda weird when i've been used to the same colonists for so long.

I almost wonder if this isn't a bug but more of a "feature". If changing how pawns are seen. Such as the normal game being just "pawn = human" I am guessing the code is actually having to change the definition of what a pawn is such as "pawn = (variable)" that variable now being human plus any other races you add. That change in itself meaning that the race of "humans" is now more than a default and is having to be programmed or defined in a new way. Thus changing the skin color of existing "default human pawns" to the new "human" pawn.

I'm guessing if you played a new game with the mod installed, the changes have already happened and thus you'd never complain of "changing skin colors". Since the default human pawn color as I'd call it wouldn't have ever been seen by you.

I wonder if you could sample the skin colors of pawns who have to be converted before the mod is installed and apply the skin color to the new "Humanoid Races version" of that pawn.

да ♥♥♥♥♥♥ ♥♥♥♥♥ все пешки теперь липо черные как жопа, либо белые как будто диареия у них я в ♥♥♥♥

There are three different issues here:
1. if you add alien races to a save file that without alien races, it will randomize skin colors for your colonists
2. the mod removes the faction skin color mechanic from vanilla, where tribals are more likely to have pawns with dark colored skin
3. the mod alters drawing mechanism for pawns that transforms normal pink-ish skin color from vanilla into pale white vampire

The author knows about all three issues, from me and considers them to be features, not bugs (in fact, he considers all three to be the same issue - I made a post earlier about pale white skin color and it was removed because apparently it was a duplicate of this topic somehow).

It was removed because of misinformation and duplicate, and yes they are the same issue. For someone who claims to have been reading my code so well, you do know surprisingly little.
3rd is also plain not true, but well.

I also don't know about these issues from you, I was aware when I coded them in.

The people in this thread are also already aware.

@erdelf Would it be realistic to have a version that had the old version of alien races skin colors?

I can see how porting over to 1.1 probably muddles this up a bit, but the old versions on the Github had a version for 1.0 that worked perfectly. I wouldn't normally be so consistent about messaging but this mod is a dependency on things like Android tiers and other race mods, so its hard to ignore. Again, thanks for your time.