Hi my cockerel who is around 3 years old has developed black scabs like things surrounded by a whiteish ring on either side of his comb, down towards his head . He seems otherwise healthy - he did have some frost damage in the winter but that was on the tips and has now healed. I don't think it's a wound of of any type as he's the only male and it's on both sides but in slightly different positions. Ive googled the problem but come to no conclusion. Any suggestions? Thanks