I have a year and a half old hen that seems to be self plucking feathers as high up on her neck as her beak can reach. I am pretty sure its self plucked. I have seen her picking at it once in awhile. It does not get down to bare skin yet, but she looks funny. I have been watching it for a month or so, no bugs, no lice, no swelling, etc. eats good, all around good health. didnt worry about it. NOW I have another one with it showing up. They have not had a molt yet,unless this is it and its so slight? What could this be? should I start to worry?????