RT Journal T1 KL tattoo on the right forearm of my 85-year-old patient JF Archives of Internal Medicine JO Archives of Internal Medicine YR 2012 FD April 9 VO 172 IS 7 SP 586 OP 586 DO 10.1001/archinternmed.2012.77 UL http://dx.doi.org/10.1001/archinternmed.2012.77 AB Grahic Jump LocationKL tattoo on the right forearm of my 85-year-old patient, Joseph, a Jewish Holocaust survivor. The tattoo was obtained at the Mielec concentration camp in German-occupied Poland during the early 1940s (Hoenig LJ. The KL concentration camp tattoo. Arch Dermatol. 2011;147[7]:781). The letters KL stand for the German term Konzentrationslager, meaning concentration camp. KL tattooing was used by the Nazis to brand and dehumanize inmates selected for forced labor at the following concentration camps in German-occupied Poland: Mielec, Wieliczka, and Budzyn.