Mine look like this also. Remember when dusting them for mites to clean the coop (including nest boxes) and dust everything. I did this on Saturday, still waiting to see what comes of it though. I couldn't see any little bugs but, it was time to clean the coop and thought it a good step to try.
	
		
			
		
		
	
				
			 
	 
 
		 
 
		 
	 
	 
	 
 
		 
	 
 
		 
 
		 
 
		 
	

 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		