A tattoo is a picture that has been drawn in your skin so that it won't come off. The ink the picture is drawn in is put under the surface of your skin with a needle. In most countries, you are not allowed to get a tattoo until you are an adult. If you change your mind about a tattoo, they can be removed with a laser but this is expensive and might not remove it completely. Temporary tattoos can come off. These are drawn on with paint, dye, or are put on as a sticker. Most temporary tattoos can be washed off, or in the case of a dye tattoo, will wear off after a few weeks.