Hi, I have my first bout with sciatica. :( I am a 53 year old female. Have had the sciatica now since about 2/4/14. Today, my husband said I have a large bruise on the area of my backside. It is on the sciatic pain spot, if that makes sense. The sciatica allieviates, then flares up, etc. I am concerned about the bruise. What would cause both issues? Thank you.