Lower leg numb/pain spot?

I’ve noticed an odd surface numbness below my knee on my left leg, about 10:30 o’clock if looking down from above at my knee. It’s not in the knee but a few inches below it in the muscle/tissue between the shin (which is 11 to 1:30) and the calf (starts at 9:30 and earlier). In addition, if I happen to brush up against there (say, laying on by stomach in bed) it can be sharply painful if there’s any pressure on that “channel”. However, it not a problem at all cycling/walking, etc.

Any idea what muscle/tendon/nerve is being aggravated?

And yes, I plan to bring it up with my doc next week.

Brendan