The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Because it is a herb specifically indicated to treat swollen glands as can be seen on Silkworm's page.
Silkworms is a Neutral herb that tastes Pungent and Salty. It targets the Liver and the Lung.
Its main actions are: Antispasmodic, subdues Internal Wind. Expels Wind and stops pain. Clears Toxins and dissipates nodules.
Convulsions in children Bells palsy Epilepsy Tetanus Migraine Sore throat Conjunctivitis Painful eyes Rheumatic pain Swellings