Hi
Welcome to Healthcare Magic Forum
Your son seem to be having
Cervical lymphadenitis.
This presents as a tender, smooth lesion in the cervical region .
It can be associated with
fever and other systemic symptoms.
It is important whether you are also suffering from any other problems like Upper respiratory infections,
sore throat, cough or
tonsillitis.
As such lymph node swellings usually occur as a protective response in our body in order to contain any such infections.
Also, if it is an acute swelling, as it is in your case, then it is relieved as the primary infection heals or is treated.
So you might need a course of
oral antibiotics along with pain killers.
I would suggest that you see a general physician who can locate the focus of infection and treat you accordingly.
Hope it helps
Wishing you speedy recovery
Dr Geetika Paul