Chickens have white callus looking spots on combs. What could it be?

[Chickenfeet67]

We have 4 amberlinks and I've noticed recently all 4 have white callus looking spots on their comb, 2 of them have little black spots as well. They are all acting normal. Still eating/drinking, poo looks normal. Thank you for any input/help!

 

[Trux]

one of my roos has these powdery white spots on his comb, went looking a DVM.com and and I believe he has ringworm. here is a link, it's a good tool to have http://www.poultrydvm.com/views/symptoms.php

 

[coach723]

The little black spots look like peck wounds. The white could be favus (that's chicken ringworm). Treatment is usually miconazole (monistat cream).