Thanks for posting your query.
What was USG report? From where that swelling was arising?
do you have any difficulty in swallowing?
Swelling in this region may arise thyroid
, retro/ parapharyngeal abscess
, enlarged lymph nodes, carotid body tumor
You should take urgent consultation with surgeon/ physician and should go for thorough check up.
You should also consult with radiologist
who had performed USG neck for proper origin of mass.
If necessary, you should also go for CT/ MRI scan neck.
You should also go for complete blood count
, ESR and renal function test.
If Thyroid then you should also go for thyroid function test.
If infectious, then you should also go for complete antibiotic course.
Dr. Mayank Bhargava