With the lack of any helpful information: Immediate guess is that you're using a 8.1 figure, and if I had to guess, most of bluejaunte's stuff is PBR (as are the rest of the higher end 8.1 figures.). The tattoo is probably forcing it back to Iray/Uber, hence the color difference. You can confirm it by looking here:
Just a guess based off the look of the skin, though. Been a while since I've used tattoos like this as I often add tattoos manually to the skin maps in Photoshop (easier to blend and adjust). If the above isn't the cause, take a look at the "Translucency Weight" on the legs surface pane. Check the number, and then select the torso and see if it matches.
Try something
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and see if it causes the same issues. That is, assuming this is an 8.1 model. If it's not, it could be a whole different set of solutions, but if that we're the case, these tattoos would probably apply fine.