I have an email out to our "Stella" who had some very, um, noticeable tatts that got covered up when we did Streetcar. She used some kind of big bandaid/latex cover, then put her make-up over it. And this is a 45 seat house with audience on top of us plus working in the house - if I can find out specifically what she used, will relay. Otherwise, the concept is the same - flesh-colored latex/flat bandaid and then skin make-up over.