i do not believe there are any labs that could detect a trace amount of any spider venom seven years after a bite nor that i can believe a venomous spider bite would still be causing lymph node reaction now i would strongly recommend that you see a medical provider and have these nodes properly examined (there can be many reasons) and perhaps have a few diagnostic tests.
what labs can detect brown recluse venom after 7 years after bite? . 2004 while showering- found on right anterior forearm-bite. . two sunken crusty itchy hard and tough blisters-minor swelling that evening. . next morning raised area with white ring center was red and brused at the two puncture/blister sites. ranch hand helped excise-with a blade flame alcohol cut / removed the area outside the white ring. . dressed it q2h until drainage stopped. eruptions came the next 3 years. can that venom affect my glands now? . test available for venom ck? . lymph nodes ent problems.