My hen has been limping. I turned her over and saw that her upper toe is a little bit swollen and on the outside of the tow (the part you can see when she is walking around) just above ground level on that outside part is a tiny bit of black shading. It's not solid black, it is patchy in an area about the size of a child's pinky nail. From what I have learned, if it were bumblefoot - she'ld have an obvious black spot on the bottom of her feet and there's nothing on the bottom of her feet (or toes)... I could be wrong. Any advice?