I answered your other post, but wanted to welcome you here in the new member area, as well. I'm happy you rescued a little lovebird in need. He may or may not grow back his feathers, all dependent on the cause and how long the issue has existed. I encourage you to take him to the best avian veterinarian in your area for a complete checkup. Can't wait to see pictures of him. Lovebirds are my favorite kind of parrot.