The art of Mehendi has existed for centuries. The exact place of its origin is difficult to track because of centuries of people in different cultures moving through the continents and taking their art forms with them and therefore sharing their art with everyone along the way.
Some historical evidence suggests that Mendhi started in India while others believe it was introduced to India during the twelfth century A.D. I personally feel that it would be hard to argue the fact that it appeared as an art form in Egypt first.