Silly Question by a newbie

[Kimberbach]

Several of my chickens have a little black spot on comb. They seem fine in all other ways. Eating, drinking and pooing well. Their yard is raked daily and no sign of "bugs". Should I be concerned? Your help is much appreciated.
Kimber

 

[Melissa Sakata]

Several of my chickens have a little black spot on comb. They seem fine in all other ways. Eating, drinking and pooing well. Their yard is raked daily and no sign of "bugs". Should I be concerned? Your help is much appreciated.
Kimber

Fowl pox?

 

[Pork Pie]

Maybe posting pics may help. It could simply be spots of dried dirt, dried blood from insect bites or some such. It could be dry fowl pox, but pics will help the ER experts to diagnose. Here's a link on fowl pox http://www.the-chicken-chick.com/2015/07/fowl-pox-prevention-treatment.html

All the best
CT