In all probability you have a mobile lymph node. There are two things you must do. Check out with the dentist to see if you haves developed any infection in mouth or have caries in tooth. Second is an ENT consult to eliminate tonsillitis or pharyngitis. Sometimes a self limiting infection causes a lymph node to swell. Other possibility is a neurofibroma (benign collection of nerves and fibers). However if it persists beyond 4 weeks you must consult the doctor. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.