@davideb22 Wow, I really did think one of those things would work. So...……...a few more questions.
Just to be sure I got the problem right, what you are seeing is just affecting male sims only and only when you have them shirtless. Correct? When you put a shirt on one of the sims affected by this, the issue goes away, right? And does it happen for all clothing categories or just one or two?
Looking at the picture you posted, I can't tell if the pants are getting the skin tone color or vice versa. So what color are the pants supposed to be? And since I don't recognize them, are they cc? Did you try changing the pants? And does it happen with the game pants, swim suits and underwear?
Did you try a vanilla test game with no cc or mods? If you did, did you create a sim and have the same issue show up? If you did, then I suggest you repair the game through Origin.
And in the test game with cc, when you created a new sim, did the issue show up? Did you see any difference at all?
Are you using any custom tattoos? Or any other cc body details? Bad custom tattoos usually turn the whole sim pitch black, including the clothes, but if the tattoo is nearly the same color as a skin tone then that is a possibility. Body details can also have weird effects. Those are mostly a body overlay and sometimes can show up over the clothes rather than under them if they were not created correctly.
Do you see anything off in CAS when you look at your clothes? I have seen some cc underwear that cause the entire bottom half of a sim to just disappear when you put it on them for instance. And other things that caused the color of the item to bleed over onto other parts of the sim.
Generally, removing a piece of cc should only affect whatever part of a sim that the cc applied to and you usually have to go in and fix that part of the sim when you remove a cc item. In your case, that would be the eyes. Do you have any other cc eyes, either addition or default replacement?
I still think this is probably cc related and you have some piece of cc that is causing it. I have had some weird things happen in my game because of cc that got outdated or was broken from the start. So going through every piece of CAS cc that you have may be what it takes to fix this.
Hope this helps. Let us know if any of things I've suggested works. This one is a real puzzler.