Her comb has black on it and is smaller in just a week what is going on poor thing Help!!

[Jkioneil]

and one more better pic of it

 

[Jazkabor]

That is a good pic, of a sad situation though. Could it be a fungus? I don't know nut I would try neosporin or even just Vaseline. But that is my uneducated try at chicken health care.

 

[kizanne]

One of my hens has a real dark area. I assume a scab. But it is from the rooster grabbing her comb instead of neck feathers when mounting.