Sick hen?

[DonnaH4603]

My hen has a some blister like bumps on her face. What can it be

 

[Eggcessive]

Can you post any pictures of the blisters? It might be fowl pox, a virus spread by mosquitoes in hot weather, but pictures would be helpful. This article has many pictures of how fowl pox can appear:
https://poultrydvm.com/condition/fowl-pox