Help with my Serama, please

[balbrt1]

I have a serama roo who is 10 weeks old. This week I noticed a faint white/grey spot on his comb. Then his comb is curling over. He does not have mites as I should be able to find them since he is white. Anyone have a clue what is happening?

 

[Whittni]

Can you get a picture of his injury? It could be serious.