I have been having constant pins and needles in my right leg which have now developed into cramp like pains, ive also noticed many bruises down my right thigh/ leg. Ive also been having lower back pain. I had spinal surgery on 2 discs in my lower back a number of years ago.
Low back pain and pins and needle sensation in the leg may due to disc prolapse or spinal canal stenosis.  Complete bed rest for a certain period of time is the initial mode of treatment in low back pain. Pain can be controlled by medication, exercise, weight reduction, lifestyle modification etc. take paracetamol 1 gm twice or thrice daily as required initially for some days. Have an MRI of LS spine done to diagnose spine problem. Bruises in the leg, I feel, is probably due to some other cause. There are many reasons of purpura.