Good move.
Don't need pics now.
Did you take food away but leave him some water?
Check crop before feeding in the morning.
Hopefully you get good pics of overnight poops in morning.
This is how I like to set up crates, so poops don't get stepped as much...
Did you try to clean them off?
That's the best way to know if it's mud.
What have the temps been?
Pics of comb, please.
So both wattle and now comb turned color just today?