remove implication sun_tattoo -> tattoo
create implication sun_tattoo -> tan
I believe the implication to tattoo was made in error, as a sun tattoo is visually distinct from a tattoo and is more like an intentional tanline. Unlike a tattoo, a sun tattoo is temporary and lighter than the surrounding skin. If anything, it should imply tan, just as tanline does.
Also, it might be better if images of tattoos with sun motifs (e.g., post #1598211) were tagged sun_(symbol) tattoo instead.