Cause of red skin? Not hot.

[viktoriacl]

My 11 week old EE has red skin at times the others dont. She also has a small hole in her beak. She is also scratching often. There are times she is not as red. They all get red when they are hot but she seems like she is uncomfortable. Could this me just mites. I gave her a dusting of sevin but I'm not sure that is it. I would think the other chicks would be scratching too. No? Any ideas?

 

[Mahonri]

Do a good inspection around her vent, under her wings, under her neck feathers and look for mites.

Then dust.