Firstly let me say I'm not medical.
But I'd guess it's a back problem.
I had a similar part of me go numb and from my understanding / research, I think I pinched a nerve in my vertabrea.... numbness went after about 2/3 months.
I did in my research find that I was probably riding with my back badly arched, so have also changed riding position, but think the pinched nerve would have grown back anyway...
Firstly let me say I'm not medical.
But I'd guess it's a back problem.
I had a similar part of me go numb and from my understanding / research, I think I pinched a nerve in my vertabrea.... numbness went after about 2/3 months.
I did in my research find that I was probably riding with my back badly arched, so have also changed riding position, but think the pinched nerve would have grown back anyway...
Er or gremlins...