5 year old with sudden lower Facial Tic

[BE22]

I have an almost 5 year old boy who suddenly developed a facial tic around the mouth and neck.  One morning he was without any tics, dropped him off at daycare and he cried for the first time in years.  When I picked him up I had to take him to a friends house because I had to work.  I later found out they noticed the tic.  The next day I dropped him off and he cried again, said he just misses me and went into class fine.  I then had to pick him up to go to jk orientation.  This is when I first noticed the tic.  He draws out the corner of his mouth and quickly inhales.  I thought he was having trouble breathing. I took him to the pediatrician who said that facial tics happen due to stress and to try to ignore it.  I am concerned that there is a larger underlying issue.  How long should we ignore it?  When he is busy with his friends playing or playing with us he does not tic.  

[margypops]

Is he on any meds as this is sometimes a side effect , I have also heard it can happen on a temporary basis due to stressful situations, would there be any problem at school does he get on okay with the teachers/children ,what about the friends house, has the friend got a child how does your son get on there..