Hi Welcome to Healthcare Magic Forum You seem to be having Cervical lymphadenitis.. Lymphadenitis is an inflammatory swelling of the lymph nodes 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, tonsillitis or any dental/oral problems.. 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