This could be a few things concerning circulation or perhaps a pinched nerve which you could try stretches/yoga, especially of the spine alignment, like hips/back to alleviate. Otherwise you should see a doctor or maybe a chiropractor. I'm definitely no doctor and even if I were I would probably say to actually see a doctor
I have that on both thighs and i haven't found anything that helps which is real shitty. Does yours hurt too? The doc says there is nothing i can do for it and that i got it from playing hockey. Leanining against the boards deadened the nerves in the outer parts of the thighs. If you find something,plz message me. Thanx.