I have a giant leopard gecko who is turning 3 this year. I went on a vacation for a week and left him with my brother. When I got back I noticed some kind of growth under his tail. He hasn't eaten anything in the 3 days I've been back. Can someone please tell me what this is? I can't afford a trip to the vet right now I don't know what to do. 
	
		
			
		
		
	

	
		
			
		
		
	
			
			
 
 
		 
 
		