I've seen something similar. There were pink and black eldar which were described to me by their owner as 'nurgle eldar' and they had the whole disease/pus/tentacle thing going on.
Don't ask, I know it doesn't make much sense.
Beth: Mistress! I want my power armor too!
Eliza: No! This is what you get for chewing gum in class! Now shut up and get with the repenting!
--Lost In Space