It has been about 3 weeks since getting a very minor dog bite (dog was up to date on its vaccinations and the bite hardly broke the skin, instead of looking like a bite, it looked more like a scrape from pavement) and the wound has healed up completely. The bite never swelled up or looked red, but even so, many weeks later, I experience burning pain when I move my arm in certain ways (typically positions where the skin is being pulled taut). Is this cause for concern?