Henna is a natural pigment that bonds with keratin in your skin. Those pretty red henna tattoos that are supposed to be temporary can actually last longer than you would like. There are a few things you can do to speed up the fading process but there is no instant removal for a henna tattoo.
Soaking the Tattoo
Since the henna dye has soaked in to the top layers of your skin, the only way to remove it is for that skin to shed exposing the new skin underneath. Soaking in warm water will help speed up this process.
Scrubbing the Tattoo
Exfoliating and using a loofah may make the henna tattoo fade a little bit, because it removes dead skin cells and dry flakes. But you don't want to do this in an extreme manner because you can actually scrub sores into your skin and raw spots look worse than a fake tattoo.
Apply Other Products
Many people claim lemon juice, whitening toothpaste, and sun will remove the henna faster than normal.
Moisturize if Off
Skin renewal creams that moisturize and provide a slight acid action can be used to make the skin regenerate faster in the area where the henna is located, but this also can cause skin damage if you use too much or too often.
Give it Time
Even with all of these methods of speeding up the removal of the henna tattoo, it is simply a matter of a few weeks before it fades away on it's own. In the meantime apply a cover up foundation if you dont' want it visible. There is no need to harm yourself or scrub your skin off, because henna really is a temporary tattoo.