Sounds like either a small fascial hernia or vein at tender area pinches nerve at that spot - sort of like what one gets when a nerve is caught up in a scar. I would circle area with a marker and get your doctor to inject area with cortisone. As well as anti-inflammatory, cortisone can have some nasty side effects of dissolving fat and inducing atrophy - however that also helps free up the nerve. Cortisone is however not a one shot wonder, and could take multiple shots as was recently documented for scar pains:
Scar Pains – More Injections to Cure Than Think
Scar Pains – More Injections to Cure Than Think | Pain Medical Musing