 [ Symptoms ] 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 punctureblister 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 [ Disease ] 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