Styes and blepharitis: eyelid problems explained

What a stye is

A stye, medically called a hordeolum, is a small, tender, red lump that forms on or near the edge of the eyelid, usually when one of the tiny oil glands or an eyelash follicle becomes blocked and infected with bacteria. It often looks like a little boil or pimple on the lid and may fill with yellow pus. Styes can make the eye feel sore, watery, and gritty, and the eyelid may swell. Most styes are on the outer edge of the lid, though some form inside it. They usually come to a head and burst on their own within a week or so, after which they heal. A stye is generally a one-off, self-limiting problem rather than a lasting condition, and it is not usually serious.

What blepharitis is

Blepharitis is inflammation of the eyelid margins, the strips of skin where the eyelashes grow. It is a common, often long-term or recurring condition rather than a single infection. It can be linked to blocked oil glands in the lids, bacteria, or skin conditions such as seborrhoeic dermatitis or rosacea. Blepharitis typically affects both eyes and causes red, sore, itchy eyelids, crusting or flaking at the lash bases, a gritty or burning feeling, and eyes that may water or feel dry. Symptoms often come and go, and the eyelids can look greasy or stuck together, especially in the morning. Unlike a stye, blepharitis is not usually a discrete lump but a more general irritation of the lid edges that tends to need ongoing care to keep under control.

Telling them apart

The key difference is that a stye is a localised, painful lump at the eyelid edge that usually appears suddenly and settles within days, while blepharitis is a more diffuse, ongoing inflammation of the lid margins affecting both eyes, with redness, crusting, and grittiness rather than a single lump. The two are related, because people with blepharitis are more prone to styes, as blocked and inflamed glands are more likely to become infected. Another lump to be aware of is a chalazion, a firm, usually painless swelling that develops when a blocked gland forms a cyst; unlike a stye it is not typically infected and can take weeks to resolve. If you are unsure which problem you have, a pharmacist or optometrist can help identify it.

Self-care that works

Both conditions respond to warmth and gentle cleaning. For a stye, applying a clean, warm compress to the closed eye for around five to ten minutes several times a day helps it come to a head and drain naturally, easing pain. Do not squeeze or pierce a stye, and avoid eye make-up and contact lenses until it clears. For blepharitis, the mainstay is regular eyelid hygiene: warming the lids with a compress, gently massaging them, and cleaning the lid margins with cooled boiled water or a proprietary lid-cleaning product to remove crusts and clear the glands. This routine, done daily and continued even when the eyes feel better, keeps blepharitis under control. A pharmacist can recommend suitable lid-cleaning products and lubricating drops for dryness.

When to see a clinician

Most styes and blepharitis can be managed at home, but some situations need professional advice. See a GP or optometrist if a stye is very painful, does not improve within a week or two, keeps coming back, is affecting your vision, or if the swelling and redness spread beyond the eyelid onto the surrounding skin, which can indicate a spreading infection needing prompt treatment. For blepharitis, seek help if symptoms are severe, not improving with lid hygiene, or if the eye itself becomes red and painful rather than just the lid margins. Any sudden change in vision, significant eye pain, marked redness of the eyeball, or sensitivity to light should be assessed urgently, as these suggest a problem beyond a simple eyelid condition and need same-day attention.