Just noticed this while I was doing coop maintenance today. No noticeable behavior changes. Seems to be eating/drinking/crowing about as much as usual. He did get a bit of frostbite on his comb during the latest freeze when he didn't go into the coop when he should have, but that's far enough from this area that I think they are unrelated. In the past I would have just wiped it to confirm it isn't just chicken poop, but wanted to double check here.
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Do you have photos of his wattles too?
He may have discoloration of white earlobes which can be common. Clean the earlobe, then apply an ointment like Zinc Oxide as suggested in the article below. Link to the PDF is there along with an excerpt from the article.
https://www.aviculture-europe.nl/nummers/09e03a06.pdf
EXTRA CARING FOR WHITE EARLOBES
White ear lobes are more easily (and more visibly)
damaged than red ones. The earlobes get crusty if the
males can reach each other through the pens. The
pecking leaves hard crusty scabs, which will reduce the
show value of a bird. Chickens of a white lobed variety
should also be kept sheltered from frost and
strong winds, as these will in almost all cases
make a white lobe rough with a tendency to
become tingled with red. Damages are often
caused by blisters that appear spontaneously;
they can burst open and give nasty scabs.
Right:
Nasty scabs in a Rosecomb earlobe.
During the years all sorts of remedies can be
read in poultry literature to heal the blisters and
other soar or red spots before entering the bird
at a show. The most important is not to wait till
the day before, but start with a week or even a
fortnight before the show and applying something to heal. These are given
suggestions:
1. Wash wish a soft piece of sponge with pure soap in tepid water,
after which it should be dried with soft towel and lightly smeared with Zinc Oxide
(a skin protective substance known for its soothing qualities). 2. Use a cosmetic
cream or oil once or twice a day on the show birds to heal them up. 3. Regularly
powder the blisters with talc, it makes them dry out and they will cure nicely.
or something else! It's certainly poo colored.
