VienneseKletzelnTo scrape yourself using your fingernails; most commonly: scraping things like pimples or woundes.

In most cases, by *kletzel*ing yourself, you scratch your woundes/pimples open. A source for all you German speakers: http://ostarrichi.org/wort-955-kletzeln-mit*den*Fingernageln*herumkratzen.html (Austrian-German dictionary).