Greetings Web MD! Thanks For This Opportunity. My Name Is

Greetings Web MD! Thanks for this opportunity. My name is Larry Ryan, I am 60yrs young and I consider my self reasonably healthy for my age and circumstance. Professions; Engineer, Master Mariner. Recently have been experiencing pain in what feels like the subcut area of my inner left thigh just above the knee area. It feels as though it is about a palm space in area, and it is acute for a few seconds then eases off a little then stabs again. this cycle continues only when I'm walking. when seated it does not occur.
Any thoughts doc? Again many thanks!!! >>>Larry.