Can PDO threads cause looser skin or scar tissue?

The purpose of using thread lift with PDO thread is to cause scar tissue build up near the thread and it helps lifting the skin. Yes it will cause the scar but it will remain inside of skin so there is no visible scar outside.
The scar tissue will not make difficult during future facelift procedure. Only drawback of the thread lift is not long lasting result.

Thanks,

Dr.Choi