First, know that you should limit the amount of time you leave it on your face. "These-glow-in-the-dark products should only be used infrequently and for short period times, since prolonged contact can cause skin irritation on any skin type," said Dr. Elias.
You can bid adieu to luminescent shadows or liners completely, since the eye area is especially sensitive to irritants, and should avoid the pigments around the ears or any open body area. Dr. Shah advises you scan the ingredients label, too: "These products should contain at least 99.8 percent luminescent zinc oxide and less than 0.02% cooper chloride. It should also be free form impurities, and there are FDA guidelines as to how little cooper, lead, and mercury can be in the products."
As a good rule of thumb, take the same measures you would when trying a new acne treatment or retinol. "A mini patch test is a must," said Dr. Bhanusali. "Try the product on the front of the elbow, behind the ear, or on any other small area that is hidden one to two days before Halloween, and if you don't have a reaction, you should be OK."