remmie

Anyone got anything for me?

I was hoping someone could give me an answer, or at least a good place to start on this question i have. I'm a writer and am currently playing with the idea of mutations w/in the human body (chromosomes, genes, etc), focusing on the effects that melanin would have as a mutation. If, in theory, the melanin was affected by the genetic mutation, what would be the most realistic outcome of skin/hair/eye color? Would it be realistic to have natural colors darken dramatically, natural colors lighten, or even have a mutation of unnatural colors mixing into hair/skin/eyes? I want to state that I am not, in any way, scientifically inclined enough to ask this the way it probably needs to be, but I've been curious and hope you all could give me a general idea. Anything that adds to this (if there's something that could do that with melanin, or something different completely) I would love all the help I could get!