The new tattoo feature suffers from the same problem on Mac as the makeup and skintone sliders mentioned in this thread: [MAC] Makeup sliders don't work when sliding to the left. I only did some q...
Ideas
I have the same problem as a Mac user. The tattoos that have the option to use the sliders (some don't) don't change when sliding to the left. And this is for tattoos from any pack because I tried it on some from expansion packs as well as some from base game. This is really frustrating because I was so excited to be able to change the color/saturation/brightness of tattoos and now I can't even really use it because it only half works. Especially since, like the post said, this has been a problem for a while. I really hope that this thread will bring more attention to the problem and that they will finally fix this bug.