Total newbie at this--picked out six chicks from Buchheits Friday and yesterday noticed one of the NH Reds has a black lump on her leg. They are around 2.5 weeks old. Chick is otherwise walking fine, eating and pooping. Thinking it might be scaly leg, I covered it in Vaseline last night and this morning. I tried to upload a pick but not sure it's showing! Any ideas what this might be and how to treat?