Thanks for your query.You had two small lumps in groin since a long time.Out of which the one on left side has increased in size Moreover you has lost almost 20 lb wt in last six months which is something that you are worried about.Do you get fever
in the evening and what is the status of appetite?has it decreased ? As this could be Tubercular Lymphadenitis
Please get following investigations done.
1) Complete Haemogram with E.S.R.
2) X ray
Please consult some Physician for detail clinical assessment and further treatment.