Can anyone tell me what's wrong with my 4 1/2 year old RIR rooster. I noticed him limping and keeping his left foot lifted off the ground. He is eating, drinking, roosting and doing all things rooster like normal but during the day is trying to stay off his feet and laying down. He is molting too. I checked him for bumblefoot and there is none but noticed the red bumps (?) at the top of his leg. I see no evidence of mites.