multiple nodular lesions

I am a 20 year old healthy male that has trouble with my lymph nodes in my right groin area. It was noticed two months ago as I had horrible pain in the area and fever. Doc thought I had a infection in the leg and ultrasound and surgery was preformed. There was no infection only a enlarged lymph node measuring 2.7cm and a small amount of fuelled around it. After a horrible recovery as the surgical wound didn’t heal and I have had to pack it daily for almost two month’s. I just had a follow up ultra sound there are now multiple nodular lesions the largest being 3.9X2.0x0.9. doc called and wants to remove it. What could be causing this ?????