I have two birds (same breed and color) that look like this.  Other than having this issue with their feathers, they seem to be healthy, good appetite, and energetic.  I dont have any roosters in my flock at this time so I cant attribute it to rough play. I am hoping this is a molt and not mites, although there does seem to be alot of "dirt" on the feathers.  My 9 other ladies dont have this issue. 
I will do whatever I have to do my keep my ladies happy and healthy.
Back, just in front of the tail feathers
		
		
	
	
		
	
Right side under the wing
		
	
	
		
			
		
		
	
				
			I will do whatever I have to do my keep my ladies happy and healthy.
Back, just in front of the tail feathers
	Right side under the wing
	
			
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