It's from PS magazine.
Germs are found in badly stored makeup. Are you keeping your tubes, bottles and palettes closed, or leaving them open for airborne pollutants to enter easily?
Some products will dry out if you don’t close them properly, making them an ideal place for microbes to breed (not to mention making them unpleasant to use).
Most of us have left a lipstick in the glovebox at some point and been confronted with the sticky mess that’s left. But makeup doesn’t need to be melted to be damaged by heat.
Store your makeup out of direct sunlight and at room temperature – because if it’s too warm, it becomes a bacterial breeding ground.