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What Percentage of Old Makeup Contains Bacteria?

Recent studies indicate that approximately 70% to 90% of all used cosmetic products are contaminated with bacteria. A landmark study conducted by Aston University tested hundreds of used beauty products, including lipsticks, eyeliners, mascaras, and blending sponges. The results showed that the vast majority of these items were teeming with microbes, including potentially harmful pathogens that can cause skin and eye infections.

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What Percentage of Old Makeup Contains Bacteria?

Recent studies indicate that approximately 70% to 90% of all used cosmetic products are contaminated with bacteria. A landmark study conducted by Aston University tested hundreds of used beauty products, including lipsticks, eyeliners, mascaras, and blending sponges. The results showed that the vast majority of these items were teeming with microbes, including potentially harmful pathogens that can cause skin and eye infections.

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The Worst Offender: Beauty Blenders

The study identified makeup blending sponges (beauty blenders) as the most contaminated tool in a makeup bag. Data revealed that 93% of used blenders had never been cleaned, despite being damp and used daily. Because they remain moist, they create an ideal breeding ground for fungi and bacteria. Statistics showed that these sponges carried the highest load of antibiotic-resistant bacteria compared to any other cosmetic product.

Types of Bacteria Found: E. coli and Staph

The bacteria found in old makeup are not harmless. Researchers discovered Staphylococcus aureus, a bacterium responsible for staph infections, in 79% of mascara samples and a large percentage of eyeliners. More alarmingly, about 25% of beauty blenders contained E. coli (Escherichia coli), a bacteria commonly found in fecal matter. This suggests that poor bathroom hygiene and dropping products on the floor contribute significantly to the contamination.

The Danger of Expired Products

Using makeup past its expiration date is a primary cause of this bacterial growth. Surveys show that nearly 98% of people admit to using makeup after it has expired. Preservatives in cosmetics degrade over time. Once the preservatives break down, they can no longer stop bacteria from multiplying. Old mascara and liquid foundation are particularly risky because their liquid formulas allow bacteria to thrive more easily than dry powders.

Understanding the PAO Symbol

To prevent using contaminated products, you must look for the "Period After Opening" (PAO) symbol on the packaging. This icon looks like a small open jar with a number inside, such as "6M" or "12M." This number tells you exactly how many months the product remains safe to use after you first unseal it. Following this guide is the best way to avoid applying bacteria-laden makeup to your face.

FAQs on Makeup Hygiene

Can I wash my mascara wand?

No. You cannot clean the inside of a mascara tube or the wand effectively. Once mascara is contaminated or expired (after 3 months), it must be thrown away. Adding water or cleaning it only introduces more bacteria.

How often should I wash my brushes and sponges?

Dermatologists recommend washing makeup sponges after every single use because they are wet. Brushes used for powders should be washed once a week to remove oils and dead skin cells that feed bacteria.

Is sharing makeup actually dangerous?

Yes. Sharing makeup transfers one person's unique skin microbiome to another. This can spread conjunctivitis (pink eye), cold sores (herpes simplex virus), and staph infections instantly.

When to See Your Doctor

If you develop a painful red bump on your eyelid (stye), persistent acne in the area where you apply contour, or pink, weepy eyes, stop using your makeup immediately. These are signs of an infection caused by contaminated products. See a doctor if the swelling worsens, and be sure to throw away all the makeup you used recently to prevent reinfection.