I noticed the bump shortly after the chic was born. Probably 2 or three days old. It struck as odd because there was no feathers growing on that spot. Now that the chick is two weeks old the spot appears to be bigger and is bulging. If it was the crop wouldn't it be covered by feathers? Also it seems hard. Wondering what the little yellow sacs are just under the skin. Perhaps grain? Just seems a little too odd.