My mother is suffering with alot of back pain and there is also a purple bruise there on her right hand side above the buttock and the pain goes right across her lower back.   Why is there a bruise there?   she does suffer from arthritis and is on medication for this she is 65 years of age.
Hi I did review your concern. The purple bruise you are talking about could be a birthmark known as Mongolian spot. Please ask your mother if its from childhood or recently noticed. If noticed recently you should consult a dermatologist to find out more about it. Forever, the back pain could be because of multitude of causes, primary could be arthritis itself or a disk herniation or lumbar spinal stenosis. Does the pain occur more walking downhill or is it relieved by bending forward. Check if she feels pain on walking on toes. If yes, she could be having lumbar spinal stenoses common at this age. You can then probably go for an x-ray and an MRI to know finer details of the backbones and muscles and spinal cord involvement. I hope this help swish you a healthy life