Through the years, I've rescued various types of snakes, but I have never seen this before and I have never owned a Ball Python...

I have a 2-3 yo ball, who does not seem to have any paralysis, with two lumps on her spine. The previous owners claim they were feeding her small mice in case eating larger mice or rats were difficult for her to swallow and digest due to the spinal lumps. She is small for her age, and although thinish for a Ball, appears healthy.

Is it possible her "lumps" are from anything other than an injury? The previous owner claims they took it away from someone who was mistreating it and that it may have been stepped on. They said they did not know. My major concern is that it may be a byproduct of being fed conservatively or improperly.

Does anyone know of any reasons a Ball might develop spinal lumps? If she does not seem to be paralysed, can I feed her larger mice or small rats? Or should I stick to what she was being fed and accept she may just be a "small" Ball Python?

Because I've never owned or rescued a Ball, I don't know if their breed has any special problems of their own. She does appear to be some kind of hybrid. She has as white a belly as I have ever seen and my son's friend claims she is a granite ball, but I have no idea. She is pretty though.

Any thoughts or recommendations?