Strange head skin

[Ale_16]

Hello, I have a problem with a few of my hens. There is a problem with their head skin. I don’t know if those can be parasites or a fungus infection. Here are a couple of pictures. The behavior is normal. Any advice? The problem is present only on my marans and Ayam cemani hens no sign of this problem on my hybrid layer chicken.
Any advice would be welcomed.

 

[HappyDuckie]

What is it that you are worried about? I don't see anything abnormal in any of the pictures.

 

[MysteryChicken]

It could be Scaley Face mites.