Pinkish bump on Parakeet's base of tail
My parakeet has a rather large bump on the top side of her body, near the beginning of the tail. She's been seemingly fine for the past year that she has had it. At times it seems to go away or start to diminish in size, but other times she bites at it and causes it to grow and sometimes even bleed a bit.
I was just wondering if it could be some sort of tumor, or an irritation. She still eats, sleeps, plays and sings, but I know Parakeets don't usually show pain as a defense mechanism. Should I be worried?