Thanks for visiting HCM.
It seems that in 2003 you were having tubercular lymphadenitis
of cervical lymph node on right side which was adequately treated by anti-tibercular therapy and you got cured as evidenced by your weight gain and subsidence of the swelling.
Your present condition of having swelling on left side behind the ear does not seem to be tubercular as FNAC findings are not suggestive of this and ESR
is just 5 and AFB stain( it is for tubercular bacteria) is negative.
It may be just an infected simple cyst
as given in your report. You just need to take a course of antibiotics as per the sensitivity pattern in your report and because the cyst has recurred, better go for excision( removal) of the cyst.
I can understand your concern but there is nothing to worry about...just consult your treating doctor for antibiotic course and excision of the cyst....