The 3 Types of Blepharitis — Bacterial, Seborrhoeic and Demodex — and Where Castor Oil Fits In

"Blepharitis" is a single word for what is really a family of related conditions. Knowing which type you're dealing with helps explain why your eyelids feel the way they do — and why a pure castor oil can be a useful part of managing all of them.

What all blepharitis has in common

Every type of blepharitis involves inflammation of the eyelid margin, and every type tends to be chronic and recurrent. The lids look red or swollen, the eyes feel gritty or burn, and there's often crusting or debris at the lash base. The differences come down to what's driving that inflammation.

1. Bacterial (staphylococcal) blepharitis

Here, an overgrowth of bacteria — commonly staphylococcus — sets up shop along the lash line. It produces hard, brittle crusts and collarettes around the lashes, and can cause lash loss and small ulcers on the lid margin if left unchecked. It's often described as "anterior" blepharitis because it affects the front of the lid where the lashes are.

In the castor oil trial, treated eyes showed a greater decrease in staphylococcal eyelash crusting than untreated eyes — directly relevant to this type.

2. Seborrhoeic blepharitis

This type is linked to seborrhoeic dermatitis — the same tendency that causes dandruff and oily, flaky skin. The crusts are greasier and softer than in bacterial blepharitis, and it often coexists with a flaky scalp or eyebrows. It's about excess, altered oil and skin turnover on the lid margin.

The trial specifically reported that treated eyes had greater reductions in seborrhoeic eyelash crusting too, meaning castor oil's conditioning, cleansing action is relevant here as well.

3. Demodex blepharitis

Demodex are microscopic mites that naturally live in hair follicles, including eyelash follicles. In larger numbers they cause a distinctive sign: cylindrical dandruff — a clear, collar-like cuff of debris wrapped around the base of the lash. Demodex blepharitis is common, frequently missed, and notoriously persistent.

Two pieces of evidence make castor oil interesting here. First, the blepharitis trial found reduced cylindrical dandruff in treated eyes. Second, a separate 2025 ex vivo study from the University of Auckland found that castor oil shortened Demodex mite survival, supporting its use — particularly overnight — against the mite itself.

Meibomian gland dysfunction: the overlap

Many people also have "posterior" blepharitis, better known as meibomian gland dysfunction (MGD), where the oil glands inside the lid become blocked. In practice, most people have a mixture — a bit of bacterial, a bit of seborrhoeic, sometimes Demodex, often with MGD on top. That's exactly why single-target treatments frequently disappoint.

Where castor oil fits

The appeal of a pure cold-pressed castor oil is that it addresses the shared lid-margin problem across all three types — loosening crusts, conditioning the skin, supporting a cleaner lash line, and (per the research) reducing both staph and seborrhoeic crusting plus cylindrical dandruff. It's not a substitute for professional diagnosis, and severe or infectious cases may need prescription treatment. But as a gentle, daily, natural measure that spans the different types, it's a sensible foundation.

One step for all three types: Meibocare LidBoost+ 100% cold-pressed castor oil is designed for daily lid-margin care across bacterial, seborrhoeic and Demodex blepharitis. Pair it with warmth and omega-3 in our dry eye treatment packages.

Frequently asked questions

How do I know which type of blepharitis I have?

An optometrist can tell by examining your lid margins and lashes — hard brittle crusts suggest bacterial, greasy flakes suggest seborrhoeic, and clear cylindrical cuffs around the lash base suggest Demodex. Many people have a mix.

Does castor oil help Demodex blepharitis?

A 2025 University of Auckland ex vivo study found castor oil shortened Demodex mite survival, and the blepharitis trial found reduced cylindrical dandruff (a Demodex sign) in treated eyes. Overnight application may be particularly useful.

Educational information only, not medical advice. References: Muntz A, et al. The Ocular Surface. 2021;19:145–150; Jennings CJ, Craig JP, et al. Anti-Demodex activity of castor oil confirmed in an ex vivo study. Contact Lens and Anterior Eye. 2025.

Part of our guide to Demodex & Blepharitis.