Abbie is my 3 year old RIR hen. Lays eggs fairly consistently. I can always tell which eggs are hers because for some reason they have always been really big and rather on the wrinkly side. The other day I noticed she has what looks like a spur growing on each leg. Its about a 1/4 - to 1/2 inch long. None of my other girls have this. What's going on?