Yesterday I was tending to the girls. I didn't notice one had her foot out through the door. I pulled the door towards me and she began squawking by the time i noticed she was limping away. They have not started laying yet. I want to say they are about 3.5-4 months old. The raised black spot on her left foot. Should I be highly concerned? Do I need to do anything? What can I use to prevent infection?