I have five 24.5 week old pullets. Everything going great..got 2 eggs from my Red Plymouth so far..so EGGCITING..BUT..Today I noticed a mass on my Dark Cornish on her right breast. It is soft and feels like it is fluid filled. She is acting normal..eating, drinking, playing. I never had chickens before so I'm hoping someone can give me some advice on what it may be and what I can do to fix it. Here are some pics



