Your Mascara Is 3 Months Old. That's a Problem.

Here's a number that should make you blink: a 2026 study found that used eye cosmetics—mascara, eyeliner, eyeshadow—harbor Bacillus and staph bacteria, the kind that cause styes (Microorganisms study on used eye cosmetics). That's not a scare tactic; it's a direct line to the most common eye infection you'll ever meet. Yet most of us treat a mascara tube like a keepsake, keeping it for a year or more. Let's bust some myths and get real about what your eye makeup is doing to your eyes.

Does eye makeup really expire?

Yes, and the clock is shorter than you think. The FDA says to replace mascara every 2–4 months (FDA Eye Cosmetic Safety). The American Optometric Association echoes that, recommending replacement every three months (AOA Hordeolum). If you've had an eye infection, toss everything immediately. That's not a marketing ploy; it's because preservatives break down, and bacteria move in.

Can I just add water or saliva to revive dried mascara?

No, and this is a hard no. The FDA explicitly warns against adding saliva or water to mascara—it introduces bacteria and overpowers the preservatives (FDA Eye Cosmetic Safety). Dried mascara isn't a tragedy; it's a cue to buy a new one. Your eyes aren't worth the shortcut.

Is "hypoallergenic" or "natural" safer?

Not necessarily. The FDA notes that terms like "natural" and "hypoallergenic" have no official meaning—companies can use them however they want (MedlinePlus Cosmetics). That doesn't mean all eye makeup is unsafe; it means you can't rely on vague labels. Look for actual ingredients, and if you have sensitive eyes, patch test on your arm first.

Does eye makeup cause styes?

It can, especially if you don't remove it. Styes happen when oil glands at the eyelid edge get infected, often with Staphylococcus aureus—bacteria that love makeup residue (Duke Eye Center). The fix isn't to stop wearing makeup; it's to wash your face at night and replace products regularly. If you get a stye, skip eye makeup until it heals (AOA Hordeolum).

Is kohl eyeliner safe?

Not all of it. Traditional kohl—sometimes sold as surma or kajal—can contain lead or antimony, and the FDA has not approved it for cosmetic use in the US because of heavy metal risks (FDA Eye Cosmetic Safety). If you're buying a kohl pencil from a big brand, it's likely reformulated and safe, but avoid anything labeled "traditional" or "authentic" without a clear ingredient list. Your health is not worth a trend.

Do microplastics in eye makeup matter?

Yes, but maybe not for the reason you think. Microplastics—tiny plastic particles under 5 mm—are persistent and hard to remove from the environment (EU Environment). Many countries, including the US, UK, France, and South Korea, have banned plastic microbeads in rinse-off cosmetics (Nature Scientific Reports). But eye makeup isn't rinse-off, so it might still contain microplastics. Look for brands that disclose their ingredient sourcing. It's a small step, but it adds up.

Is it safe to share eye makeup?

No, and this isn't just a hygiene tip—it's a health rule. The FDA advises against sharing eye cosmetics, including retail testers, because you can spread infections (FDA Eye Cosmetic Safety). That includes your friends and that sample at the store. If you must try a tester, use a disposable applicator.

Should I throw out eye makeup after an eye infection?

Absolutely. The FDA says to discard any eye cosmetics you used during an infection (FDA Eye Cosmetic Safety). Bacteria can live in the product, and you'll just reinfect yourself. Same goes for your brushes—wash them or replace them. It's the only way to break the cycle.

Quick tip: Set a reminder on your phone to replace mascara every three months. It's the single cheapest insurance for your eyes.

Bottom line

The best move you can make for your eye health is to treat expiry dates as law. Replace mascara every 2–4 months, never share, and never add water. That's it. It's not glamorous, but it beats a stye.

Sources

• FDA Eye Cosmetic Safety - https://www.fda.gov/cosmetics/cosmetic-products/eye-cosmetic-safety
• MedlinePlus Cosmetics - https://medlineplus.gov/cosmetics.html
• Microorganisms study on used eye cosmetics - https://europepmc.org/article/MED/42197397
• AOA Hordeolum - https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/hordeolum
• Duke Eye Center styes - https://dukeeyecenter.duke.edu/news/what-causes-stye-and-best-ways-get-rid-one-featuring-singh