What would cause rose-colored stains? Curious.
The obvious implication is blood, but as described above, this should be impossible.
Substitution: A possible explanation, but to me seams unlikely. I think Kellhus would have noticed at some point that there where 2 people. If the sub stayed at the entrance, he should have stopped Cnaiur/skin-spies, or at least caused a ruckus.
Stigmata: Hilarious. Moe anointed by the Solitary God, a true living prophet, slain by a false one? Not sure on this one. False Stigmata maybe? He opens the wounds in his eyes on a daily basis to portray this illusion?
Kellhus Hallucination: Like the Haoles, he sees it because he thinks they are there.
Authorial Lapse: Bakker forgot that Moe shouldn't be bleeding. Very unlikely. Moe has been blind for years, or at the very lease, months. He shouldn't still be bleeding, and that would be a fairly large mistake.
This line of thought led me to wonder again about the Psuke metaphysics. I think that one must be blind to unleash any water. My guess would be it has something to do with seeing the world as it truly is, unmarred by the false sight of eyes. I think that maybe everyone who can see the Onta that blinds themselves would posses the "third site". Akka described his vision as something akin to seeing the world as it truly was, so maybe being blind is just the next step. Onta sight is seeing a half-truth, and as such the sorceries mar it, while the Psuke see the whole-truth, allowing them to manipulate it fully and leave no mark.
I truly hope Akka created something extremely dangerous when he blinded Iyokus. The blind necromancer...