If you have rosacea — the facial redness and flushing that affects millions — and you also struggle with sore, gritty, irritated eyes, the two may be more connected than you realise. The link often comes down to a familiar culprit: Demodex mites.
The rosacea–Demodex link
People with rosacea tend to have significantly higher densities of Demodex mites on their skin than people without it. Researchers still debate cause and effect — whether the mites help trigger rosacea's inflammation or simply thrive in rosacea-prone skin — but the strong association is well established. The mites, and the bacteria they carry, appear to feed the inflammatory process.
How it reaches the eyes
Rosacea doesn't stop at the cheeks and nose. When it affects the eyes and eyelids, it's called ocular rosacea, and it commonly shows up as blepharitis, blocked oil glands (meibomian gland dysfunction), and dry, irritated eyes. Because Demodex populate the eyelash follicles and lid oil glands, the same mite overgrowth driving facial rosacea can drive the eyelid inflammation too. That's why so many people have both facial rosacea and stubborn lid symptoms.
Signs your eye symptoms may be rosacea-related
Facial redness or flushing alongside eyelid irritation
Red, thickened lid margins with cylindrical dandruff
Recurrent styes or chalazia
Burning, gritty, watery eyes that don't fully respond to drops
Managing both together
Because Demodex can sit at the centre of both, reducing the mite burden may help calm eyelid symptoms — and a gentle approach matters, since rosacea-prone skin and eyes are easily irritated. This is where castor oil is appealing: a 2025 University of Auckland ex vivo study found it shortened Demodex survival, and it's gentle enough for sensitive lids and daily use. Combine that with warmth for the oil glands, gentle lid hygiene, and dermatologist-guided care for the facial rosacea itself.
See the right professionals
Ocular rosacea benefits from teamwork: a dermatologist for the skin and an optometrist or ophthalmologist for the eyes. Don't ignore persistent eye symptoms — untreated ocular rosacea can affect the ocular surface over time.
People with rosacea have higher Demodex densities, and the mites appear to contribute to the inflammation, though the exact cause-and-effect is still studied. The two are closely linked.
Can Demodex affect the eyes in rosacea?
Yes. Ocular rosacea often involves Demodex-related blepharitis, blocked oil glands and dry eye, which is why facial rosacea and eyelid symptoms frequently occur together.
Educational information only, not medical advice. Reference: Jennings CJ, et al. Anti-Demodex activity of castor oil confirmed in an ex vivo study. Contact Lens and Anterior Eye. 2025.doi:10.1016/j.clae.2025.102471 (PubMed)
