When John Cena revealed that his red, itchy, crusty eyes were actually caused by eyelash mites, many people had the exact same reaction:

“Wait... eyelash mites are real?”

As surprising as it sounds, Demodex mites are incredibly common. Most adults have small numbers of these microscopic mites living on their skin and around their hair follicles. In most cases, they cause no symptoms. But when they overpopulate the eyelids, they can contribute to a condition called Demodex blepharitis.

The tricky part is that many people mistake the symptoms for dry eye, allergies, aging, screen fatigue, or simple eye irritation. In a recent educational YouTube video, Dr. C., founder of Eye Drop Shop and a double board-certified optometrist, explains that persistent eyelid irritation is not always “just dry eye,” and the root cause may actually sit at the base of the lashes.

If your eyes constantly feel itchy, gritty, crusty, or irritated, especially in the morning, it may be worth taking a closer look at your lash line.

What Is Demodex Blepharitis?

Demodex blepharitis is inflammation of the eyelids caused by an overgrowth of Demodex mites, primarily Demodex folliculorum and Demodex brevis (Fromstein et al., 2018).

These mites tend to live:

• Around eyelash follicles
• Along the lash line
• Near the meibomian glands, which help produce the oily layer of your tears

A small amount of Demodex is considered normal human flora. Problems typically arise when the mite population increases significantly, leading to inflammation and irritation of the eyelids (Liu et al., 2010).

Common Symptoms of Demodex Blepharitis

Many symptoms overlap with dry eye disease and other forms of blepharitis, which is why the condition is often overlooked.

Common symptoms include:

• Itchy eyelids
  
• Crusty lashes
• Burning or stinging
• Sticky eyes upon waking

One of the most important clinical signs eye doctors look for is something called collarettes. These are cylindrical dandruff-like sleeves that form around the base of the eyelashes and are considered a classic sign of Demodex blepharitis (Murphy et al., 2020).

Why So Many People Miss the Signs

One reason Demodex blepharitis often goes undiagnosed is because the symptoms can feel “normal.”

People commonly blame:

• Screen time
• Aging
  
• Seasonal allergies

That is exactly why John Cena’s story resonated with so many people. He initially assumed his symptoms were simply part of daily life.

In reality, the issue may not only involve the surface of the eye. Sometimes the inflammation begins directly at the eyelid margin.

Not All Blepharitis Is Caused by Demodex

This is an important distinction.

Blepharitis can have several underlying causes, including:

• Bacterial overgrowth
  
• Meibomian gland dysfunction
• Demodex infestation
  

That is why self-diagnosing based on symptoms alone is not recommended. An eye care professional can evaluate the eyelids under magnification and determine whether collarettes or Demodex are present.

If you are experiencing persistent eyelid irritation, ask your eye doctor:

Could Demodex blepharitis be contributing to my symptoms?

What Is Xdemvy?

In the United States, a prescription treatment called Xdemvy has gained significant attention after being featured in John Cena’s campaign.

Xdemvy contains lotilaner ophthalmic solution 0.25%, which specifically targets Demodex mites.

The medication works by affecting the nervous system of the mites, ultimately paralyzing and eliminating them (Torkildsen et al., 2023).

Clinical trials demonstrated significant improvement in collarettes and mite eradication after six weeks of treatment (Torkildsen et al., 2023).

At the time of writing, availability may vary depending on your country, and Canadian patients should consult their eye doctor regarding current treatment options available through Health Canada.

At-Home Tips for Managing Demodex Blepharitis

While prescription treatment may be necessary in some cases, proper eyelid hygiene plays a major role in symptom management.

Here are several practical steps that may help support eyelid health.

1. Use Warm Compresses

Warm compresses can help soften crusting and loosen debris around the lashes.

A clean heat mask or warm washcloth may also support healthy meibomian gland function, which is often disrupted in blepharitis and dry eye disease.

Important hygiene reminders:

• Use a clean cover on your heat mask
• Wash reusable covers regularly
• Do not share heat masks with others

2. Clean the Lash Line Daily

Daily eyelid cleansing is one of the most important habits for managing blepharitis.

Gentle foaming eyelid cleansers and hypochlorous acid sprays are commonly recommended because they help remove debris and bacteria while remaining gentle around the eyes.

For example, the WE LOVE EYES Eyelid Foaming Cleanser is a gentle option often used to support daily lash line hygiene.

You can view it here: WE LOVE EYES Eyelid Foaming Cleanser

Some patients also prefer silicone-based or vibrating eyelid cleansing tools to help support more thorough cleansing along the lash line, such as the BlinkJoy Electric Eyelid Brush 2.

You can view it here: BlinkJoy Electric Eyelid Brush 2

The goal is not aggressive scrubbing. Instead, focus on gentle cleansing where the lashes meet the eyelid.

3. Replace Old Eye Makeup

Makeup products that touch the lashes can harbor debris and bacteria over time.

Consider replacing:

• Mascara
• Liquid eyeliner
• Lash products

more frequently, especially if you have active blepharitis or recurrent styes.

Many eye care professionals recommend replacing mascara every three months, though some patients prefer shorter replacement cycles for better hygiene.

One practical option is choosing smaller or travel-size mascara formats so they can be replaced more often. The CHESHMA Nourish & Flourish Mascara Set is designed with this type of rotation in mind.

You can view it here: CHESHMA Nourish & Flourish Mascara Set

Another option is the ÈYES ARE THE STORY Eye Proof Mascara Trio Set, which also comes in smaller units that support more frequent replacement.

You can view it here: ÈYES ARE THE STORY Eye Proof Mascara (Trio Set)

4. Wash Pillowcases and Makeup Brushes Frequently

Oil, skin cells, makeup residue, and environmental debris can accumulate on fabrics and brushes.

Helpful habits include:

• Washing pillowcases regularly
• Cleaning makeup brushes often
• Avoiding shared towels or eye products

These simple changes may help reduce reinfection and irritation around the eyelids.

Is Demodex Contagious?

Demodex mites can spread through close contact and shared personal items, but there is no need to panic.

Good hygiene practices are usually enough to reduce transmission risk.

Avoid sharing:

• Eye makeup
• Towels
  
• Heat masks
  

When Should You See an Eye Doctor?

You should consider scheduling an eye exam if you experience:

• Persistent itchy eyelids
• Crusty lashes
• Recurring styes
  
• Burning or gritty sensations
  

A proper diagnosis matters because not all eye irritation is caused by dry eye alone.

The Bottom Line on Demodex Blepharitis

John Cena’s eyelash mite story may sound shocking, but the real takeaway is surprisingly practical.

If your eyes constantly feel irritated, itchy, crusty, or inflamed, do not automatically assume it is just screen time, aging, or fatigue.

Sometimes the problem sits directly at the base of the lashes.

Demodex blepharitis is more common than many people realize, and with the right diagnosis, eyelid hygiene routine, and treatment plan, symptoms can often improve significantly.

If you suspect something more than “regular dry eye” may be going on, ask your eye doctor to evaluate your eyelids for blepharitis and collarettes.

Your lash line may be telling a bigger story than you think.

References

Fromstein, S. R., Harthan, J. S., Patel, J., Opitz, D. L., Morettin, C. E., & Perry, H. D. (2018). Demodex blepharitis: Clinical perspectives. Clinical Optometry, 10, 57-63. https://doi.org/10.2147/OPTO.S142708

Gao, Y. Y., Di Pascuale, M. A., Li, W., Liu, D. T., Baradaran-Rafii, A., Elizondo, A., Kuo, C. L., & Tseng, S. C. G. (2005). High prevalence of Demodex in eyelashes with cylindrical dandruff. Investigative Ophthalmology & Visual Science, 46(9), 3089-3094. https://doi.org/10.1167/iovs.05-0275

Liu, J., Sheha, H., & Tseng, S. C. G. (2010). Pathogenic role of Demodex mites in blepharitis. Current Opinion in Allergy and Clinical Immunology, 10(5), 505-510. https://doi.org/10.1097/ACI.0b013e32833df9f4

Murphy, O., O'Dwyer, V., & Lloyd-McKernan, A. (2020). The prevalence of Demodex folliculorum and Demodex brevis in ophthalmic patients. Eye & Contact Lens, 46(Suppl 2), S154-S159. https://doi.org/10.1097/ICL.0000000000000674

Torkildsen, G., Sheppard, J., Asbell, P. A., et al. (2023). Lotilaner ophthalmic solution, 0.25%, for Demodex blepharitis: Results of a randomized controlled trial. Cornea, 42(7), 809-817. https://doi.org/10.1097/ICO.0000000000003260