A<unk>  is a medical device that doctors, embalmers, and surgeons use to hold skin, internal organs, blood vessels and all other tissues of the human body together after they have been severed by injury, incision or surgery.  They must be strong so that they do not break, non-toxic, hypoallergenic (to avoid adverse reactions in the body), and flexible (so they can be tied and knotted easily). In addition, they must lack the so called "wick effect", which means that<unk> s must not allow fluids to penetrate the body through them from outside, which could easily cause infections.
Surgical suture
Foreskin restoration
Dressing 
Gangrene surgery
Cellulitis surgery
Skin grafting
Prosthesis
Chemical peel