You do have spinal stenosis.
That can cause numbness of the left thigh and outer buttock due to the compression of the nerve root.
Other possibilities include diabetes, thyroid disorder, vitamin B12 deficiency.
Since you do not have any weakness, this is not urgent.
But yes, you do need to see your doctor for further evaluation.
Vitamin B12 1000 mcg daily, vitamin B6 50 mg daily, Alpha lipoic acid 1200 mg daily may help with the numbness.
Physical therapy of the lower back also will be beneficial.
It was my pleasure to help you today.
If I have answered all your questions, Please rate my response Excellent (click on the smiley faces) under this chat box only.
Please bookmark my profile for asking further questions!
This is the link to my profile: