Swollen lymphnode on the neck can be due to many conditions.Infection is the commonest cause.
If it is due to simple bacterial infection,antibiotics and anti inflammatory drug will cure the condition.
If there is visible node still,get it removed and send it for Histo pathological examination(Biopsy
infection is the commonest cause of enlarged lymphnodes
in the neck.
Please get the Biopsy done and come back with the report.
I will clarify further.
Wish him good health