Block spots, should I be concerned?

[FaerieChicken]

I notice most of my hens have these spots on their combs and waddles, pictured is a pullet about 4 months old and our hens are varied in age one group little over 1 year and the other group about 2 years!
I have researched on this site but they aren't sick, and they have had them for as long as I have had them in September, pulleys I got in October!

 

[New Hampshire]

Hi, I'm not sure of the cause, but I'm pretty sure that they aren't worth worrying over. My chickens have had them for years, and they never seemed to bother them.