Just taken photo. This growth has literally mushroomed in 4 days. Now it is huge. There us nothing inside the upper mandible that looks wrong. This morning it looked so much bigger and earlier there was a small crack 3ml and a bit black on the brownish, now yellowish bulge. When I went to take the photo it was bleeding slightly. Perhaps mother is trying to peck it off. I will try to post the photo now but I am not too experienced at this form of communication. The second photo is 4 days ago but the wart is not too visible. Thank you again. Ps we live in italy where it is very hot, there are many insects that bite terribly. We have 3 other juveniles who show no signs, gift from a neighbour, we have 2 geese and 2 sheep who are seperated and a Rooster, dad, and 1 other bantam type who is in the same coop but sitting on eggs for last 17 days with little interaction with other chickens. Thank you again for any advice. I do fear the worst.