When a character has two or more distinct colors making up their layer of skin.
This doesn't include naturally occurring differences in colors such as areolae, nipples, bruises, tan and blushing to name a few. At least one of the skin colors has to be unnatural and the colors have to be visually distinct from each other.
For instance, post #472760 has blue skin and red skin divided evenly on her flesh.
This tag implicates colored_skin (learn more).
The following tags implicate this tag: two-tone_skin (learn more).