I am experiencing extreme tingling and burning on the top and outside of the right foot and ankle and sometimes above the ankles and toes. Sometime it itches badly and my skin appears darkened or mottled in that area of concern. It has been gradual and of late has become extreme. A year ago I did have my leg veins lasered because of damaged valves. I suspect some kind of nerve damage because I do have some pains up my leg into my sciatic area. Today it was worse after I walked for 20 minutes.