Hes about 5yrs old and has had this discoloration for about a month. I thought it was just normal shedding but it still hasnt gone away and baths haven't helped. Im not sure if it is yellow fungus, the pictures I've seen don't resemble what I seen on him. I have been cleaning the area with witch hazel for about a week now. Some of the whitish area did flake off almost like a shed but it is still discolored underneath. There is also 1 scale below the white arear that has a yellow color with a tiny black dot in it. It just showed up withing the past day or 2. Here is a pic, please let me know what you think. Unfortunatly Im also having a hard time finding a vet in my area that will see a berdie, apparently they only like dogs, cats, and birds here.