magic8697 wrote:I like Mandrakes idea. But I do not have the tattoo on my inner arm. It is on my left bicepe(I think).

You're not sure where your own tattoo is? Just kidding.
If it's there then depending on your style, this is something I think might work...
You put a large bandage over your tattoo and roll your sleeve up (or just go sleeveless). Don't make a comment on it unless someone explicitly asks about it.
Then do the forces, follow Mandrake's idea (which I think is really superb) up to the point where you pretend you couldn't get it the first time. Then act annoyed and peel off the bandage quickly, saying something about how your new tattoo is itching,
and without drawing attention to the tattoo, quickly shift all focus back to the table/cards/etc. and concentrate somemore. "Fail" a 2nd time, then rub your hand over the tattoo, complaining how the itchiness is interfering with your concentration. So when they are focusing on you rubbing your bicep, just reveal the tattoo, let the moment sink in. Then turn back around with a cheeky smile so the audience gets the idea that you have known this all along (else they wouldn't understand why you fail twice when you have the prediction tattooed in already). Still smiling, roll down your sleeve and say, "Well... Maybe we'll try something else, shall we?" and proceed to the next effect.
If someone notices the bandage in the first place and questions you what it is, just say it's a new tattoo that's healing.
If your style suits, you can even "colour" the bandage and the area around the tattoo with a bit of fake blood to make it all the more realistic.