PDO threads are colorless and not visible under the skin when placed at proper depths by an experienced practitioner.

https://www.google.com/maps/d/u/0/embed?mid=1zX9M1jDaTc-KcvLR3DRtSZbLY7uIyTc&ehbc=2E312F&noprof=1

PDO threads are colorless and not visible under the skin when placed at proper depths by an experienced practitioner.