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If you are simply looking to lighten your tattoo ink then tattoo removal creams containing TCA will help to do just that. If you are looking to remove your tattoo completely, combining the application of TCA with laser tattoo removal treatments will help to achieve more affective tattoo removal.
Tattoos fade over time from UV light (sun burns ruin tattoos) and from the body replacing skin cells over long periods of time. You're shedding and replacing skin on your hands more than just about anywhere else on your body so the process is faster... I don't think that means you can rub a tattoo elsewhere off...