Is this color comb and all the little scab like "stuff" on the faces of our older girls normal? Our three old hens have had problems with scaley leg mites and I'm wondering if the lack of color in their combs and kind of gunk bits on their faces are a problem. They have always been kept separately from our five younger girls who have nice red, cleaner combs and faces. My older face certainly has aged, so maybe that is all that is happening with the elderly hens.....I've used "Nu-Stock" a combination of mineral oil, sulfur and pine oil on their legs, which seemed to work previously. Any other suggestions for the scaley leg mites?