Hi, I have 4 chickens 1 cream legbar, 1 exchequer leghorn and 2 bantams. I have had them since chicks and they are now about a year and a half old. I have just noticed that the legbar has quite a big bald patch under her chin and i do not know why. She along with the leghorn have just started laying again. THe bald patch does not look that red or raw. Does anyone have any ideas?