Hi thanks for your query
Your 4 years child is having swelling on the superior part of neck,just below the ear lobe from last 2 months
This swelling which your son is having is called as cervical lymphadenopathy
that is enlargement of cervical lyph nodes.These lymph nodes are normally present there and get enlarge in infection of pharynx (throat) and ear.cervical lymhadenopathy is usually present in childeren.in this age group
.consultation with physician is encourged to determine the cause of cervical lymphadenopathy .He needs antibiotic therapy for 1 week.If lymhadenopathy doesn't regress with antibiotic,He may need FNAC (fine needle aspiration cytology) of the lymph node to know the etiology of swelling .Hope I answered your question.