An eyelid infection typically shows up as redness, swelling, and some form of discharge or crusting along the lid margin or lash line. But the specific appearance varies quite a bit depending on the type of infection. A stye looks like a painful pimple, blepharitis coats your lashes in flaky crust, and cellulitis turns the whole lid a deep red or purple. Here’s how to tell what you’re looking at.
Styes: A Pimple-Like Bump at the Lid Edge
A stye is the most recognizable eyelid infection. It appears as a red, sore lump near the edge of your eyelid, often right at the base of an eyelash. External styes sit on the outside of the lid and look almost exactly like a small pimple. Internal styes form deeper inside the eyelid when an oil-producing gland gets infected. You may not see the bump directly, but the lid will look puffy and feel tender.
Styes are painful from the start. The skin around the bump is inflamed, and you may notice yellow pus collecting at the center as it comes to a head. Your eye might water more than usual, and it can feel like something is stuck in your eye. Most styes affect only one eye at a time. They generally resolve on their own within a week or two with warm compresses.
Chalazion: A Painless Bump Farther Back
A chalazion looks similar to a stye but sits farther back on the eyelid, away from the lash line. It forms when a blocked oil gland becomes inflamed and swollen. The key visual difference is that a chalazion usually isn’t painful, at least not at first. It starts as a firm, round bump under the skin of the lid. As it grows larger, the surrounding lid may turn red and become mildly tender, but it lacks the sharp soreness of a stye.
Chalazia tend to grow more slowly and can linger for weeks or even months. They sometimes start as a stye that didn’t fully resolve. If a bump on your eyelid has been there for a while but doesn’t really hurt, it’s more likely a chalazion than a stye.
Blepharitis: Crusted, Flaky Lid Margins
Blepharitis doesn’t produce a single bump. Instead, the entire lid margin looks irritated. You’ll notice redness along the edge of the eyelid, and depending on the type, the lashes may be coated in flakes, crusts, or a greasy film. Many people first notice it in the morning when their eyelids are stuck together or rimmed with dried discharge.
The appearance depends on what’s driving it. Bacterial blepharitis produces hard, fibrinous scales and matted crusts at the base of the lashes. In more severe or long-standing cases, lashes can fall out, grow in the wrong direction, or develop small collar-like rings of debris around their base. Seborrheic blepharitis looks different: the lashes appear oily or greasy, with soft, waxy flakes that mat across the lid margin of both eyes. It often resembles dandruff on your eyelashes.
Another form, called meibomian blepharitis, involves the tiny oil glands along the inner rim of your lid. Those glands can become plugged, giving the lid margin a bumpy or grainy texture. Your tears may look foamy or bubbly because they lack the oil layer that normally keeps them smooth. Ulcerative blepharitis is the most aggressive variety. It can cause small sores along the lid edge that bleed when you try to remove the crusts.
Unlike a stye, blepharitis is a chronic condition. It tends to come and go rather than fully clear up, and it usually affects both eyes.
Viral Infections: Clusters of Small Blisters
Herpes simplex virus can infect the eyelid, and it looks distinctly different from bacterial infections. It appears as a crop of small, fluid-filled blisters (vesicles) clustered together on one eyelid. These blisters are typically unilateral, meaning they show up on one side only. The surrounding skin is red and may feel tingly or burning before the blisters appear.
Herpes zoster (shingles) can also affect the eyelid when it involves the nerve branch that supplies the forehead and upper face. The rash follows a similar pattern of grouped blisters but tends to be more widespread and intensely painful. Any time you see a cluster of small blisters on or near your eyelid, especially on one side, it warrants prompt attention because the virus can spread to the cornea and affect your vision.
Cellulitis: Deep Redness and Heavy Swelling
Cellulitis around the eye looks more alarming than other eyelid infections. The lid becomes severely swollen, sometimes to the point where you can barely open your eye. The skin takes on a deep red or purplish color and feels warm, tight, and painful to touch. It almost always affects one side.
There are two levels of severity. Preseptal (periorbital) cellulitis stays in the tissues in front of the eye. The lid is very swollen and red, but your vision stays normal and moving your eye doesn’t hurt. Orbital cellulitis is the more dangerous version: the infection has spread deeper behind the eye. Signs include pain when you try to move the eye, the eyeball pushing forward or bulging, and noticeable vision changes. Orbital cellulitis is a medical emergency.
What Discharge Color Tells You
The type of discharge around your eye offers a useful clue. Clear, watery discharge suggests a viral infection or simple irritation. White, foamy discharge is common with blepharitis or dry eye. Yellow or green discharge, especially if it’s thick or pus-like, points toward a bacterial infection. A stye, for example, often produces yellow pus, while bacterial conjunctivitis linked to blepharitis can leave yellow-green residue crusted along the lashes.
Sticky discharge that causes your lids to seal shut overnight is typical of both bacterial blepharitis and conjunctivitis. If the discharge is stringy and mucus-like rather than crusty, it may indicate a tear film problem rather than a true infection.
Infection vs. Allergic Reaction
A swollen, red eyelid isn’t always an infection. Allergic reactions can look strikingly similar, but a few visual cues help distinguish them. Allergic swelling (contact dermatitis or angioedema) often affects both eyes, while infections like styes and cellulitis are typically one-sided. Allergic eyelids tend to be puffy and smooth with minimal scaling, whereas infected eyelids often have visible crust, flakes, or a distinct bump. Blepharitis specifically produces yellow scaling at the lid margins, something allergic reactions don’t.
Skin texture matters too. Allergic contact dermatitis may cause fine peeling or tiny blisters across the lid surface after days of exposure, but the overall texture stays relatively uniform. Infections are more focal. A stye creates a localized painful lump, blepharitis concentrates along the lash line, and cellulitis produces deep, spreading redness with significant warmth. If your swollen lid itches more than it hurts, an allergy is more likely. If it’s painful and warm to the touch, infection is the stronger possibility.
Changes to Your Eyelashes
Eyelid infections can visibly change your lashes over time. Bacterial blepharitis is the most common culprit. In frequent or long-standing cases, lashes may thin out or fall out entirely in patches. Some lashes grow back pointing inward toward the eye, which causes additional irritation and a scratchy feeling with every blink. You might also notice white or gray discoloration of the lashes in chronic cases.
These lash changes are one reason blepharitis is worth managing even when it feels mild. The longer the lid margins stay inflamed, the more likely the hair follicles are to be permanently affected.