11.   Pierce the skin with a fingernail or the tip of a small sharp knife and slip off the skins.

12.   Researchers in the United States have found that acoustic waves make the skin temporarily permeable, so doctors can sample body fluids or inject medication without piercing the skin.

13.   These devices require cables or tubes that pierce the skin, increasing the risk of infection.

14.   A child had bones piercing his skin.

15.   No wires or tubes pierce the skin, reducing the risk of infection.

16.   The attacker had been wearing a bulletproof vest, but a bullet pierced the skin under his arm and reached his heart.