Hazards of Dirty Makeup Brushes
Makeup brushes harbor bacteria picked up from the skin, cosmetic products, makeup bags, counter tops, and even the air. To reduce your chances of bacterial skin infection, it's important to keep your makeup brushes clean. Dirty brushes should be washed at least once a week.
Avoid cross contamination by never, ever, using another person's makeup brushes, or makeup. Chances are, you don't know how well their makeup brushes have been cleaned, when they were last cleaned, if they have been exposed to an open wound, or even a pus filled pimple. Most importantly, you have no way of knowing if the bacteria, Staphylococcal Aureau, is present which could lead to a range of problems from minor redness to bloodstream infections, and even death.
Reference:
Illinois Department of Public Health. Illinois Department of Public Health, Web. 26 Nov. 2009.
How to clean makeup brushes
Wash brushes weekly with a brush cleanser, or anti-bacterial soap; rinse well under hot water; and let them thoroughly air dry before working with them again.
If possible, keep makeup brush handles from sitting in liquid after being washed. Hang them by their handles with the bristles facing down; this allows the water to drip away from, instead of to, the handle and is a more sanitary way of drying.
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