Before using a tattoo pen, it is recommended to conduct a small-scale test on the inside of the arm or other inconspicuous areas to ensure no allergic reactions. When using, keep the skin clean and dry, gently press the tip of the pen to draw patterns on the skin, and pay attention to controlling the force and speed to achieve the best results. After drawing, wait for the ink to dry naturally. If you need to extend the tattoo retention time, you can apply a proper amount of transparent makeup powder or waterproof spray to fix it.