Is there a risk of blot clots formation that may result in deep vein thrombosis or heart attack or stroke?

Great question, thank you.  While blood clots or serious complications can be a risk with any procedure, they are very rare.  If you are young and healthy the likelihood of a DVT occurring from an otoplasty is minimal.  Best thing to do is make sure you are up walking and moving during your post operative recovery period.  Best thing to do is ensure you are healthy prior to your surgery and discuss your concerns with your surgeon.  
The most common complications associated with otoplasty are asymmetry, persistent ear protrusion leading to revision surgery.  Thanks again for the great question.  Best wishes, Dr. Lindsay Sturm

  In our practice, the otoplasty procedure is performed under local anesthesia as an outpatient surgical procedure, therefore any health complications mentioned in your question are exceedingly rare.  It is also important  to make sure that you are in excellent health before  undergoing elective cosmetic surgery.