Strange mottled pattern and redness on legs

[sarahbobo]

Hi, this is my hen Bon. She is a 7 year old Welsummer, still laying (although not atm since it's winter), has already finished molting this year, and the flock has scaly leg mites. I haven't noticed signs of them on her personally, but I have noticed these dark spots appearing on her legs, as shown in the pictures. The backs of her legs are a little red, too. Her comb and face look a little pale to me, so I'm trying to get more nutrients into the flock. Does anyone know what could be causing these dark patches and redness to show up on her legs? Is it related to the SLM? Apologies for poor photo quality, I'm lacking a good camera and Bon doesn't like people getting close to her.

 

[Wyorp Rock]

She's 7 years old. I don't see anything concerning, looks ok to me.