Lymphadenopathy is a term meaning "disease of the lymph nodes." It is, however, almost synonymously used with "swollen/enlarged lymph nodes". When the infection is of the lymph nodes themselves, it is called lymphadenitis, but when the infection is of the lymph channels, it is called lymphangitis. Enlarged lymph nodes are a common symptom in a number of infectious and cancerous diseases. It is a recognized symptom of many diseases, which...
I don't think enlarged lymph nodes in your groin has anything at all to do with an STD!! Did the doc take any blood work? There are numerous reasons...