Most eye cysts appear as small, round bumps on or near the eyelid, ranging from barely noticeable to pea-sized or larger. Their exact look depends on the type: some are red and inflamed, others are skin-colored and firm, and a few are translucent or bluish. Here’s how to identify the most common kinds based on their appearance.
Chalazion: The Most Common Eyelid Bump
A chalazion is a slowly growing lump caused by a blocked oil gland in the eyelid. It typically appears on the upper eyelid, set back a bit from the lash line. In its early stage it may look red and slightly swollen, but within a few days it often becomes a painless, firm, round bump roughly the size of a pea. Small chalazia measure 1 to 4 mm across, medium ones 3 to 7 mm, and large ones can reach 8 to 12 mm.
Because chalazia sit within the eyelid tissue rather than on its surface, they often look like a smooth dome pushing outward under the skin. The overlying skin may appear normal in color or slightly pink. If you flip the eyelid, you might see a reddish or grayish area on the inner surface. They’re easy to confuse with styes, but their location and lack of a pus-filled head are the key visual differences.
Stye: Red, Painful, and Right at the Lash Line
A stye develops from an infection at the root of an eyelash, so it sits right along the lash line. It looks like a small, tender, red bump, and it frequently develops a visible white or yellowish pus spot at its center, similar to a pimple. That white head is one of the easiest ways to tell a stye from a chalazion.
Most styes form on the outer edge of the eyelid, though they occasionally appear on the inner surface. They tend to come on quickly, reaching full size in a day or two, and they’re noticeably more painful and inflamed-looking than chalazia.
Milia: Tiny White Dots Near the Eyes
Milia are very small, firm, white-to-yellow papules that measure less than 3 mm across. They look like tiny pearls trapped just under the skin’s surface. Around the eyes, they most often appear on the eyelids, cheeks, and forehead. On darker skin tones, milia can have a subtle bluish tint.
These cysts form when dead skin cells get trapped beneath the surface, creating a hard, dome-shaped bump. They can show up as a single spot or in clusters. Unlike styes or chalazia, milia aren’t red or inflamed. They feel like a small, hard grain under the skin and don’t change much in size once formed.
Cysts on the White of the Eye
Conjunctival inclusion cysts appear directly on the eye’s surface rather than on the eyelid. They look like small, round, clear or slightly translucent bubbles sitting on the white of the eye. The fluid inside is usually clear, giving them a water-blister appearance, and the thin wall of the cyst lets light pass through.
People often describe noticing a “round lesion” on their eye, sometimes accompanied by a feeling like something is stuck in it. In rare cases, shed cells can settle to the bottom of the cyst, creating a whitish layer inside an otherwise clear bubble. These cysts are benign and can range from barely visible to several millimeters across.
Hydrocystoma: Translucent Bumps at the Eyelid Edge
Hydrocystomas are fluid-filled cysts that come from sweat glands in the eyelid. They characteristically appear as very small, clear or bluish, cystic bumps close to the eyelid margin. The median size is only about 1 mm, making them easy to overlook. Their translucent, almost glass-like quality distinguishes them from the opaque look of a chalazion or stye.
Epidermoid Cysts on Eyelid Skin
Epidermoid cysts (sometimes called sebaceous cysts) form a smooth, dome-shaped elevation under the eyelid skin. They range from about half a centimeter to several centimeters and feel compressible but not squishy. A telltale feature is a small dark dot, called a punctum, at the center of the bump. This is essentially a tiny pore opening. If the cyst ruptures or is squeezed, it can release a foul-smelling, yellowish, cheese-like material.
These cysts are skin-colored and mobile, meaning they shift slightly when you push on them. They grow slowly and are painless unless they become infected, at which point the surrounding skin turns red and tender.
Dermoid Cysts Near the Eyebrow
Dermoid cysts are present from birth and most often appear near the outer eyebrow, at the upper outer corner of the eye socket. They look like a painless, smooth, firm lump along the bony rim of the eye socket. More than half of head and neck dermoid cysts occur in this area around the eye.
These cysts are usually noticed in a child’s first year of life. They feel solid and rubbery, move slightly under the skin when touched, and are typically skin-colored. Because they sit along the bone rather than on the eyelid itself, they can look more like a hard marble beneath the skin near the eyebrow than a typical “eye bump.”
Cysts on the Inside of the Eyelid
Some cysts form beneath the inner lining of the eyelid, called the conjunctiva. These aren’t visible unless you flip the eyelid. An intratarsal cyst, for example, appears as a smooth, white, non-inflamed lump embedded within the firm tissue of the eyelid. It stays put when you move the overlying skin, which helps distinguish it from cysts sitting in the loose skin above.
Other internal cysts can appear brownish or grayish when viewed through the pink tissue of the inner eyelid. You might feel the bump more than see it, noticing a sensation of pressure or fullness when you blink.
When a Bump May Not Be a Cyst
Most eyelid bumps are harmless, but a few visual features should prompt a closer look. Eyelid cancers, particularly basal cell carcinoma, can mimic the appearance of a cyst. Warning signs that set them apart include loss of eyelashes in the area of the bump, a pearly or waxy edge around the lesion, tiny visible blood vessels (telangiectasia) on the surface, new or worsening pigmentation, and irregularity or distortion of the eyelid margin.
A benign cyst is typically smooth, symmetrical, and stable in appearance. A bump that ulcerates, bleeds, changes color, or keeps recurring in the same spot after treatment deserves evaluation. This is especially true for bumps with a hard, indurated base that feels firmly anchored to the tissue beneath it, rather than the soft or mobile feel of a typical cyst.