A big part of Halloween makeup is color. But this is your skin we're talking about. Think about what you're putting on it. You might not want to put the same coloring on your skin that a car company uses in its paint.
Luckily, you don't have to. The law says that color additives have to be approved by FDA for use in cosmetics, including color additives in face paints and other cosmetics that may be used around Halloween time. It also includes theatrical makeup.
Read more: https://www.fda.gov/cosmetics/cosmetic-products/novelty-makeup