<s>[INST] I was water skiiing, fell, and bent my back backwards really hard when I hit the waves. There is now a bump on my lower spine that hurts a little when Im exercising. Ive had it x-rayed and the doctors say there is nothing wrong, but the bump wasnt there before the accident. [/INST] Hello! Welcome on Chat Doctor! Regarding your concern, I would like to explain that the bump is related to soft tissue injury (muscles, ligaments and subcutaneous tissue), caused by the trauma you have had. But, as long as your spine X-Ray study has resulted normal, and you have no numbness in the lower limbs or difficulty with walking, there is nothing to worry about. You should just be patients, because it will take some time for the bump to resolve spontaneously. Hope you will find this answer helpful! Wishing all the best,  </s>