I am not a Ver but a Budgie of mine had that problem and the Avian Vet said it was fue to lack of protein during the process of molting. Feathers require/ are made mostly with/ of protein. I had to give him soy protein, egg white and a bird meant supplement... In a month he was already looking MUCH better.
Last edited by FaeryBee; 05-09-2019 at 10:38 AM.