Although the medical literature doesn't mention it, the massage therapists I know say lingering sensitivity is pretty common (and they're dealing with non-labor spionals/epidurals as well). The Obs I had with my first vbac also said that it's something they hear frequently and that the bio-mechanics make perfect sense (an injury near a bunch of nerves = potential for lingering funky sensations).
For myself, the 'pain" from the spinal injection site was mostly an ache for a week or so. Then everything felt fine unless someone touched the injection site. Yowsa! It was a very specific, almost electric, sensation that was very painful and totally out of the blue. Dh would forget and rub the spot while rubbing my back and I'd yelp! This lasted about 3 years. In the last year or so the sensation when pressed is more like hitting a bruise than being jabbed with a hot electrode so I'm counting this as an improvement!
However, it can't hurt to ask your care provider to take a look. It's possible that a cyst has formed, or a minor infection, or some sort of treatable swelling is causing the problem. Given the location, it's a better safe than sorry thing in my mind.
