I have a .5" lump on the left side of my inner thigh. I think it might be a swollen lymph node. It has been there for over a week, changing shape from small pea to grape size and sometimes feels irregular. I have not had an virus or infection for a while, but I did get back from a very adventorous trip to south america 2 months ago. Could it be related? Also it is just on one side of the thigh, is this normal, or abnormal. Thanks for any insight.