Good question and very well presented!You have already done all the research and these lumps are indeed swollen occipital lymph nodes which are very common after a throat or upper respiratory infection in this age group.You do not need to take your little son to a doctor. the wswollen lymph nodes will take a long time to disappear.
On another note, please do not allow your son to be given a very strong and long lasting cortisone such as Betanoid and also Betnesol nose drops [also a strong cortisone which is absorbed into his body] to clear his blocked nose when he has a cold. Only use saline nose drops.
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