sometimes lumps can be a benign mass of tissue that is unexplainable. Many times ive come across them in massage therapy.the key is to know what non benign lumps look like. things such as the shape, is it irregular, is it changing in size, externally is it raised, what is the color etc etc this will give one more information.
im more concerned about the hives and why you would have them. In my opinion if i had this situation i would use the bowel formula #2 with plantain tea 5x daily along with immune boosting(organic purple garlic 2-3 large cloves every 2 hours). if it was a lymph node the the infection would move to the next node quite quickly and spread. breaking out in hives is like an allergic reaction to something perhaps heat,a bite of some kind, something you ate etc Thus no matter what the cause two things need to be done 1 boost the immune system and 2 cleanse the bowels/liver/blood.
if after faithfully doing these for a couple weeks improvement does not take place a reassessment will be needed and a different approach needs to be taken.
ps i would be careful about naturopaths as they do very strange treatments.