thanks for posting on HCM,
It is possible that your son developed lymphadenitis
which is caused by a likely post-viral cough
. Certain infections can react and present as swollen lymph nodes
or the lymph nodes themselves could be have been affected by the infection (viral, bacterial etc).
I suggest you get your son to see a pediatrician
who can examine him fully, run some few blood tests (aimed at determining signs of infection such as ESR, CBC, CRP etc) and then provide an appropriate treatment to clear off the infection and also treat the swollen lymphs nodes. Medications might include an antibiotics (e.g amoxicillin
) and an antiinflammation (e.g ibuprofen).
hope this helps