Bruising and LBP are both side effects of heparin.

http://www.healthblurbs.com/heparin-anticoagulant-blood-thinner-may-cause-hai...

No, not the heparin. I took Heparin for a month after the brain surgery before last (cerebral stent placement) but I have been off of it for months. I am wondering if you ever got any answers for this. Mine is just like this and has gotten progressively worse over the course of the last month. If there is a way to do so, I can show you the photos. I have had 7 brain surgeries, and two spinal surgeries. I still have unresolved issues and they have resulted in multiple spinal taps on a regular basis. I havent had one since July 2 though, and now the rash is really getting bad. Did you ever find out anything?

Did you ever get any answers to your post. I have a degenerative disc disease and chronic pain and woke up yesterday with bruising across my back just like yours. Very curious to find out but dont want to waste my doctors time for just a bruise??!!
Thanks Jo