Last week I banged my shin on metal lawn chair didn t look serious, so I put some first aid cream on it....however, it has developed a red circle around the wound, just larger than a quarter...no streaks. Subsequently I hshouldave had a sharp pain in my foot (same leg) and now a little discomfort in my jaw and neck all on the left side. Should I be alarmed....I haven t had a tetanus shot in years. I am 75