Apart from taking anti-inflammatory medication, there is nothing you can do as the swelling is due to increased number of blood cells fighting the bacteria or viral infection.
If you have had swollen lymph gland for more than a couple of weeks then do go and see your doctor. After a month or so, if they have not gone down then a number of investigations can be used.
Full blood count, Differential white cell count, Lymph node biopsy, CT scan, Chest x-ray
Other possible tests: bone marrow aspirate
Tender nodes normally indicate the presence of infection, so it could be associated with an ear or throat infection. However it does sound quite large so if it doesn't go away or you have any history of unexplained night sweats, unexplained bruising or bleeding or recent loss of weight then see your doctor sooner.
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