unfortunately it's impossible to say what this might be without a physical exam. i'd say the most likely possibility is an inguinal hernia. but only a medical professional conducting a physical exam can say for sure. less likely explanations are a sexually transmitted disease like syphilis and cancer. it's also possible this is a cyst (non-cancerous) or lipoma (also non-cancerous). i'd suggest you call your primary health care provider and have this looked at. take care!
there is a really sore and swollen area between my right testicle and leg. is it a hernia? syphillis? cancer?