<s>[INST] I have a small lump appeared on my lower back, it's sensitive to touch but doesn't seem to affect my movement. I did fall a couple of days ago but have only just noticed the lump and the soreness. Any ideas what it could be and whether I should get it looked at or wait for it to go down? [/INST] Hi...it could mostly be a hematoma following your fall... take some analgesic and it will resolve...if it still persists after a week or you get fever show to a doctor...Dr. Ashish Verma </s>