Hi, Our chickens are mostly indoors still but when the weather is nice I put them in an enclosed run in the backyard for a few hours in the afternoon. They have partial grass and sand. And I threw out a handful of frozen corn for them to peck at. When I brought them in I noticed 2 of them have swollen chests, mostly on one side. I felt it and it feels kind of like a cyst. But it wasn't there before I put them out. They are acting normal. I would think it was a spider bite or something but they both have it. The third chicken is normal. Any ideas?