we have only had Bella for a little over two months, she is almost six months old. but she looked good when we picked her up, it developed shortly after we got her... I do believe they breed fro profit and i am sad about that.. but as for Bella she looked healthy and our vet saw her in three days from us getting her ans she was great then.
If you have had Bella for less than 6 mos, does your vet feel she qualifies as "unfit for sale"? Sadly your breeder is not high integrity and appears to breed for profit.
I do know a friend of mine had a female with a cyst on her head. It was benign. Sometime they grow and disappear without surgery. Her female was 7 mos old and had plastic surgery because she is a show dog. So she is fine now. I wish you luck with Bella!