Hi! I've had tweety for 4 years, and his back has been like this for a few months. I thought it was just molting at first but I think it's not the right season for that. I honestly don't know what to do, whenever I go near he spreads his wings and opens his beak as if he were to get agressive. He doesn't sing much, he just chirps every now and then and I spray his back very lightly with water since the pet shop owner told me it would relieve him. It breaks my heart seeing him like this, I never let him get lonely so I'm not sure if it could be psychological. I'd really appreciate if someone could help.