Two of my five hens got the obvious sighns of bumble foot. The plug is there. Their feet do not look swollen and they are not limping. The other two hens do not have the black plug, their feet look fine, but they are limping. Can the have bumble foot with out the obvious sighn of the plug? I am getting the courage to operate on the two with the plug but should I try to do the same on the other two? I hope I am making sense, I am so stressed out about trying to do this surgery today!! I appreciate any, any imput.