Thanks for writing to H.C.M. for your query.
I have gone through your query regarding your ear infection
and swelling of neck of same side. I would like to tell you that this neck swelling is most probably is due to enlargement of lymph
nodes of neck secondary to ear infection, because lymphatics from ear goes and drain to neck glands of same side.
Second possibility of direct spread of infection from air cells of mastoid tip to neck spaces, here it will be a neck abscess
To confirm it you should do-
(a) C.T.scan of affected ear.
(b) FNAC from neck swelling.
These two investigation will confirm the relationship between ear infection and neck swelling and will help in planing for treatment.