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 quick testing, but for me the only slider that worked correctly to the left was the Opacity slider.
I didn't check every single tattoo, but I did a quick run through of a handful of them. So now none of the makeup/skintone/tattoo sliders are working as they should on Mac.
