1.   Often, scratching the skin because it is itchy results in secondary infection.

2.   Blasted against my hand, the crystals felt as if they were lightly scratching my skin.

3.   For reasons that confound medical science, Velez feels that bugs are crawling over him, and so he scratches his skin to the point of mutilating himself.

4.   You rub something like Tiger Balm or Vicks VapoRub on the skin and scratch the skin with a coin.

5.   If you run out of shaving creams, never use soap, it clogs the razor and scratches the skin.

6.   It likely led Herod to scratch his skin, opening it up to infectious bacteria.

7.   Sometimes secondary infections occur, especially if the victim scratches the irritated skin.