Not only do situations like these shed light on the need for more regulation in the cosmetic industry , but they also prove just how important it is to do patch tests and educate yourself on ingredients — especially when it comes to what you're putting on children. "Kids' skin is more sensitive than adult skin," explains Dr. Alan J. Parks, MD, dermatologist and founder of DermWarehouse . "Some have allergic reactions to glycerin in makeup. Another possibility is that the makeup may have been old and therefore not safe for the child (or anyone) to use. At a young age, children may also not know how they react to certain things. If they are going to use any makeup, parents should do a patch test to make sure they don't have any allergic reactions before letting them put the makeup all over."