Why does my parakeet have bump located on the stomach?

There are bare any feathers found on or around the bump area. Why might have this occurred? What should i do?

Could be a tumor and it is bothering her.Have her vet checked by either an Avian Vet or a vet that works with birds alot.Most dog and cat vet's know little if anything about avain species and you need a good vet that knows what he is doingfor this female bird.Call several local vets, tell them this problem and ask what they charge for a exam, then make a appointment soon.