Ive looked up pictures and noticed that the lump looks like milk neck but it is a hard lump and is 5 months and has Been weaned for months now. He is a nubian boer cross. I think i have ruled out bottle jaw because the lump is not far on his chin its just wear his chin and neck meet. It is about the size of a quarter. I will post pics later but i need help on what causes CL and would an exceed of penicillin help it?