4-H rooster with seed like white spots on comb

[Fantasia]

Hello! Looking for any advice on what could be on my roosters comb and any treatment. They are hard bumps in between grooves on my roosters comb. I have tried pulling them out with tweezers but they are rooted in there and I have tried putting iodine on them. Anything would be helpful, thanks!

 

[sassysarah]

Pic?

 

[Fantasia]

Pic?

Here's a picture he's had them since last summer