Eye infections typically cause some combination of redness, swelling, and discharge, but the specific appearance varies depending on what’s infected and what’s causing it. A bacterial infection often produces thick, colored discharge, while a viral one tends to look watery and red. Knowing these visual differences can help you figure out what you’re dealing with and how urgently you need care.
Bacterial Conjunctivitis (Pink Eye)
Bacterial pink eye is one of the most recognizable eye infections. The white of the eye turns pink or red, and the hallmark sign is thick discharge that’s yellow, green, or white. This discharge tends to accumulate overnight, often crusting your eyelids shut by morning. You may need to gently wash your lids apart with a warm cloth before you can open your eyes.
In more aggressive cases, the discharge can be heavy and pus-like, sometimes reappearing within minutes of wiping it away. One particularly severe form, called hyperacute bacterial conjunctivitis, produces massive amounts of discharge and progresses rapidly. If you notice discharge that heavy, especially with significant lid swelling, you should be seen the same day.
Viral Conjunctivitis
Viral pink eye looks different from the bacterial version. The redness is similar, but the discharge is thin and watery rather than thick and colored. Your eye may tear constantly, almost like you’re crying from one side. You’ll often notice it starts in one eye and spreads to the other within a day or two.
The eyelids can look puffy, and you might feel a gritty sensation, as though there’s sand under your lid. Because viral conjunctivitis is caused by the same family of viruses behind the common cold, it frequently shows up alongside a sore throat, runny nose, or swollen lymph node near your ear. That pairing is a strong clue that the infection is viral rather than bacterial.
Styes and Chalazia
A stye is a red, painful lump near the edge of your eyelid that often looks like a pimple. External styes grow at the base of an eyelash and may develop a small pus spot at the center. Internal styes form inside the eyelid and are harder to see, but you’ll feel a tender bump when you press on it. Most styes come to a head and drain on their own within a week.
A chalazion looks similar at first glance but has a few key differences. It develops farther back on the eyelid, away from the lash line, and is typically painless or only mildly tender. Chalazia tend to be firmer and rounder than styes and can grow larger over time. A stye that doesn’t resolve sometimes turns into a chalazion, leaving you with a hard, pea-sized bump that persists for weeks or months.
Blepharitis
Blepharitis is an infection or inflammation along the eyelid margins, and it has a distinctive look. The edges of your eyelids appear greasy or coated with small, flaky scales that cling to the base of your eyelashes. Think of it as dandruff for your eyelids. Your lids may look red and slightly swollen along the lash line, and the irritation tends to be worse in the morning.
Over time, blepharitis can cause your eyelashes to fall out, lose their color, or grow in abnormal directions, curving toward the eye instead of outward. It’s a chronic condition that often flares and fades, so many people notice these signs coming and going for months before seeking care.
Corneal Infections
Infections that reach the cornea (the clear front surface of your eye) look and feel more serious than conjunctivitis. A corneal ulcer may appear as a white spot on the cornea. Depending on its size, you might be able to see it in the mirror as a small cloudy or whitish area over your iris or pupil. The surrounding eye is usually very red, and you’ll likely have significant pain, light sensitivity, and blurred vision.
Fungal corneal infections have a unique appearance that even eye doctors look for specifically. The infected area tends to have feathery, irregular borders rather than a clean edge, and smaller satellite lesions may appear nearby, separate from the main spot. Fungal infections are less common than bacterial ones but are more likely if you’ve had a plant-related eye injury or wear contact lenses in rural settings. One warning sign: a corneal ulcer that isn’t improving with antibiotic drops may be fungal rather than bacterial.
Eyelid Cellulitis
Sometimes what looks like a bad eye infection is actually a skin infection around the eye. Preseptal cellulitis causes the eyelid to become red, swollen, warm, and tender to the touch. The swelling can be dramatic enough that you can barely open your eye. Despite how alarming it looks, the infection stays in front of the eye socket, and your vision and eye movement remain normal.
Orbital cellulitis is the more dangerous version. It shares the same red, swollen eyelid but adds several critical differences: pain when moving your eye, double vision, bulging of the eyeball forward, and changes in how well you can see. In children, it often comes with fever and a visibly ill appearance. If the swelling is so severe that the lid can’t be opened, or if there’s any change in vision or eye movement, that combination signals a potential emergency that needs imaging and treatment right away.
Internal Eye Inflammation
Uveitis is an inflammation inside the eye itself. From the outside, it can look deceptively mild. The most visible sign is a ring of redness that hugs closely around the colored part of your eye, concentrated near the edge of the cornea rather than spread across the entire white. This pattern, called ciliary flush, looks different from the diffuse pinkness of conjunctivitis.
The more telling symptoms are what you feel rather than what you see. Uveitis causes a deep, aching pain in the eye, genuine sensitivity to light (not just discomfort but a reflexive need to shut your eye), and blurry vision. In severe cases, a doctor examining you with a slit lamp can see white blood cells floating in the fluid inside your eye or even settling into a visible white layer at the bottom of the iris. Uveitis can cause lasting damage to vision if untreated, so the combination of eye pain, light sensitivity, and redness around the cornea warrants prompt evaluation.
How to Tell What You’re Dealing With
A few quick visual cues can help you sort through the possibilities:
- Thick yellow or green discharge: likely bacterial conjunctivitis
- Watery, clear discharge with cold symptoms: likely viral conjunctivitis
- Painful red bump on the eyelid edge: likely a stye
- Flaky, crusty lash line: likely blepharitis
- White spot on the cornea with pain and light sensitivity: possible corneal ulcer
- Dramatic lid swelling with fever or vision changes: possible orbital cellulitis
Contact lens wearers deserve a specific mention. Any redness, pain, or white spot on the cornea that develops while you’re wearing contacts could indicate a corneal infection. Remove your lenses immediately and don’t switch back to them until you’ve been evaluated. Corneal infections in contact lens users can progress quickly and threaten vision if treatment is delayed even by a day or two.