I have an oblong vertical indentation on my lower left leg to the right of the shin. what could be causing it & what kind of dr. should i see?

See doctor: You need to start with your primary care physician first to examined it physically, so that a preliminary diagnosis can be made. Then your pcp will be able to tell you the next step, or if imaging is needed, and refer you to the right person to see for further workup if needed. This is something that you would want to have documented in your chart.