Lung scar

Its been 12 yrs ago that i got  a ptb from my patient,i am a nurse and working before in a public health nurse in our country,i know that the scar is still in my lungs,i worked in hk for 5 yrs and my scar in my lungs is never be a hindrance to me to get the job.....now im here in dubai and got a job and my worries and scared me is my old ptb scar ,my employer asking now my passport to the processing of working visa,im in visits visa and my visits visa is until 2 nd week of january,i am thingking now that what if im using first my visits visa until it was due or tell them the truth?thank you for who can give me some advice....

how are u know  Smurfets?