[BAReF00t]

So he’s blue-skinned.

Or are you implying he exists or existed for real independent of people’s psychotic heads?

[statictype]

All the written source material about him implies that he is dark skinned.

Visual representations of him show him as blue for other reasons (mainly the comical stigma against dark skin).

[manquer]

Perhaps OP is implying that writer(s) of myth observed this colouration in real people and used it in their myths.