thanks for your query at HCMlymph
node enlargement in neck region is quite common in children.
because children will have infection that will cause lymph node to enlarge.
first you have to find cause for lymph node enlargement , most commonly it might be because of infection in sinus
, upper respiratory tract
get child examined for infection in these sites.
if any source is found you can take medication accordingly and lymph node size will decrease after that.
if no source is found child might need repeat ultrasound
and fine needle aspiartion cytology (fnac) of lymphnode.
fnac will rule out any major abnormalities.
hope this solved your query