Nico,

I hope this question is not too invasive, but I feel it is relevant. Did you have any sexual contact during the month before the appearance of the rash on your leg? Also, where on your leg was the rash (thigh, lower leg, groin, etc.)?

I have similar symptoms to yours that started after a herpes virus infection. Herpes viruses are neurotropic and can cause lots of neurological issues, though the medical establishment doesn't fully recognize them. I'm a member of a group on a different forum of people with neuropathy/neuralgia as a result of herpes infections.