Hi Mic,
Danke für deine Einschätzung. Wir hatten mal alle Fälle bei Pubmed zusammengesucht und kamen zu folgendem Ergebnis:

The authors identified 51 publications and 63 total cases of tattoo-associated skin cancer. We also report on a single new case of tattoo-associated skin cancer observed at one of our co-authors' institutions. Among these 64 total cases, 58% were associated with black and blue inks and 34% were associated with red ink.