It sounds very suspiciously like incipient IT band syndrome. The problem manifests itself at two different points on either end of the IT band: The greater trochanter at the hip end, and the lateral femoral condyle at the knee end. I have had it at both ends, the first time being exactly where you describe your pain, and with exactly the same kind of pain your describe, at least initially. I can tell you for sure that you do not want it to get worse, as it did with me. It put me out of commission for a year, and spelled the end of my racing days. I ended up having a surgical procedure to relieve the pressure on a bursa that was inflamed by the pressure of a tight IT band on the bursa where the IT band passed over it at the lateral femoral condyle. I’m not for a minute suggesting surgery, but I would consider, yes, seeing an orthopedic physician to either confirm this possible diagnosis, or point you in some other direction. I say this because IT band problems are something you definitely want to catch early, and doing so means ascertaining whether that is the problem.
Here is a link to a set of diagrams outlining the anatomy of the IT band. Hopefully it will clarify what I am getting at. IIRC, John Shannon is a physician. Perhaps he would be willing to elaborate on this?
https://search.aol.com/aol/image;_ylt=Awr9IkrhNMRaVjMAyQFpCWVH;_ylu=X3oDMTByZDNzZTI1BGNvbG8DZ3ExBHBvcwMyBHZ0aWQDBHNlYwNzYw–?q=it+band+condyle&v_t=webmail-searchbox#id=10&iurl=https%3A%2F%2Fdubinchiro.com%2Fwordpress%2Fwp-content%2Fuploads%2F2013%2F10%2Fit2.gif&action=click