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The two main causes of spots on a comb are peck marks (usually jet black) and fowl pox. Try again on posting your picture. Here is some reading with good pictures about fowl pox:
https://www.backyardchickens.com/articles/avian-pox-how-to-treat-your-chickens-for-avian-pox.47704/
http://www.the-chicken-chick.com/2015/07/fowl-pox-prevention-treatment.html