Swelling back of neck. & usg reports!

I have small swelling on back of neck which is painless , soft , normal skin color observed since Nov 19 . When I observed it  consulted to general physicians & taken antibiotics joyclav 650 , 40 nos of tablets for 14 days approx  & First Usg  done dated 22/11/2019 it was  hypoechoic lession of  5 mm × 3 mm called focal lymphadenitis. After 2 months again I personally done usg of neck , then conclusion was a small hypoechoic lession 8 mm × 5 mm is chronic inflamatory lession is back of neck . I have also done routine test of blood TC , DC, total cholesterol, sugar, LFT all are permisible limits in the report . There is no symtoms of fever, loss of appetite, night sweating etc . Even this swelling is not hampering in my day to day activities also . No past history of tuberculosis and sugar , there is no other swelling in the bodies . Please conclude whether it is anything serious. I am much anxious because of it is painless. I am attaching current picture of nape of neck & usg reports