Bump on tail

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My female bp has had this bump on her tail since I have had her (2 1/2 months). I didn't notice it much when I 1st got her being a novice. It doesn't seem to be getting larger & it is not like a scap or surface issue. Kinda feels like a bone is larger than the rest of them. It does not effect her eating shedding or moving around at all. I was wondering if anyone knows what it might be & if I should be concerned about it before I feel it is worth a trip to the vet? Here are pictures:

[kilabyte]

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[Kaorte]

Its a spinal kink. This is a common birth defect, well common as far as birth defects go. it is kind of like human scoliosis. As long as she eats poops and sheds regularly she will be just fine

My little mojave has a similar little bump on his tail.