Leucism appears similar to, and often confused for, albinism.

The main difference is in the eye color, which is not affected by Leucism. It's safe to assume that if a character doesn't have red eyes, they are leucistic and not albino.

Piebaldism is technically partial leucism, but is unique enough to have its own classifications and designations.

Also, characters based on species that can't be albino (like white tigers) CAN be leucistic.

Wikipedia page: http://en.wikipedia.org/wiki/Leucism