Best way to create tattoos for Daz Studio

I was wondering if anyone has experience with applying tattoos to their Daz Studio characters? What's the best way?

I'm pretty new to Daz, but I know I can edit the character skin maps to do this. My problem is if my location for a tattoo crosses the boundary of two different maps I have no idea what to do. 

Anyone give me any tips? I would be very grateful. 

I might be wrong but i think the LIE editor helps with that. 

This is a pretty good video explaining how to do it....

Thanks for the replies guys. Didn't know much about the layered image editor. I see this is definitely a different way to do it, but I'm still stuck on being able to cross texture map boundaries. I could very well be using the image editor wrong but I cant seem to do it. LIke if want the tattoo to be on her back area but it goes onto her shoulder area to. That would be torso and arm texture maps. 

Also, now I'm stuck on how to line them up if they wrap around a part of the body. Like an arm band tattoo. Ugh... So much to learn! Anyone know?

But thank you for your replies!