I was asked by the owner of this rooster if I could figure out what this is on his leg. It is a patch of skin the size of about 3 x 3 inches on the skin on the front of the drum area and the surface is very hard but the skin around it is still soft and normal looking. The first time it was noticed the rooster was limping and the spot was the size of a pinky finger nail about 5-6 weeks ago. It feels like a thick pad of skin is also under this odd patch of skin but not attached to the muscle of the leg. I have not seen this before.....anyone have any ideas what it is and how to treat it? Sorry about the pictures, I don't have that good of a camera. a picture from the side to show good skin and the thick black callus type skin shows the dark color and bumpy surface of it another picture showing healthy skin and the callused skin. He will limp off and on and this thing is growing..... is it cancer or what and how do we treat this.....thanks.