During my camino in 2016 the front of both my thighs turned numb and sometimes tingly. It feels a bit like the anaesthesia at the dentist, only in my legs. I couldn't figure out what was causing this, until I met a hopitalera in France who had been a physiotherapist. She immediately asked me how I carried my pack. Sure enough, I carried it wrong. I wore the hipbelt around my hips (snugly strapped), instead of letting it rest on my hips. Subtle difference, but an important one.
Back home I consulted another physiotherapist who told me the first one had been spot on with her diagnosis. Because I wore the hipbelt around my hips, I thereby 'locked' my hipbones and because of that pinched/damaged a nerve in the groin area, resulting in a loss of feeling in my thighs. It has been more than two year ago, and the feeling still hasn't completely returned, although there has been a little improvement. It doesn't hurt though, so I just live with it and haven't felt the need to seek further treatment.
So do check the way you wear your pack! Other than that, see if conservative treatment, like removing overweight, belts or pinching clothing might help (it does for 85% of those affected). Last resort can be a blockade of the skin nerve by way of pulsed radiofrequency treatment. They'll usually only do that after a (successful) short term test-blockade with anesthetic fluid and anti-inflammatory medication. In my case this isn't worth the hassle. All the best in figuring out your next step.