Apply concealer to the tattoo on your finger. For best results use two shades (light and dark), spreading the light concealer first, followed by the dark.
Blend the concealer into the surrounding areas to give it an even flow.
Apply powder to the tattoo with a pad. Dab the tattoo and the surrounding area to achieve a natural look.
Apply foundation to the area in small and delicate increments. You don't want to apply too much foundation or it will be obvious you have makeup on your finger and draw attention to it, which defeats the purpose of covering it up.
Blend the foundation in with your fingers until it looks natural.
Apply powder once more to seal it all in, and you are ready to go.