Just put a spray tan over it
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If I were going to use a dye on my skin for something like this, I would first test it out on a small patch of skin some place where nobody's ever going to see it, like on my penis.
I think you'll need a bigger patch of skin to actually see the results.
Do the whole unit and if something goes wrong tell the doc you fucked Shrek.
I'd worry about making a mess. What's the smallest eyedropper they sell?
I too would want to test patch it. But I would put it off too long and end up skipping the test patch.