There is a huge variation in hair colour from black through to a light sandy shade, but look closely and most have a huge mix of hair colours within their coat. Around the jaw and backs of the ears it can also be wooly, almost like sheep wool. With regard to skin pigment there do not appear to be any noticeable tones or patches. I did catch one on trail cam a few years ago with a thin summer coat which under the IR you could definitely see skin markings / colouration similar to domestic breeds, that said it may well have been a crossbred boar /domestic pig.