I had 2 back surgeries july 2017 (herniated disc) and had alot of numbness in my left leg. most numbess went away, only a little remained, until recently when numbness seems to be spreading in left leg.feel pins and needles sometimes in feet and leg?

Call FP or surgeon : While post surgical compression does occur, this time frame doesn’t fit. You will need an CT/ MRI of the affected area and a hands on exam to best determine the cause of these ‘new’ symptoms. Good luck

Need re-evaluation: Now close to 4 years, and wear and tear can proceed. If you had fusion, expect focal degeneration both above and below surgery level. A little late for active scarring, but not too late for recurrent nerve irritation or compression.

Major Symptoms...: If Numbness with Needles and Pins in the leg are the major symptoms (Peripheral Neuropathy), rather than Back Pain; consider some Vitamin- like Vitamin B-12 Deficiency -as possible cause of some of the new symptoms. A more Comprehensive Medical Exam with appropriate Labs & Imaging are indicate and it is best to see the PCP

Low back pain : I have evaluated over 20,000 people with spinal conditions. After two low back surgeries, and disc herniation most likely you have scar tissue in the back which set up a new reason for new leg numbness after several years. One should consider other reasons for the numbness such as diabetes, Lyme or B12 deficiency. See an experienced spinal specialist to consider these issues