A red, swollen inner eye corner is most often caused by a blocked or infected tear duct, a stye, or conjunctivitis. The inner corner of your eye contains a concentrated cluster of delicate structures: tiny drainage openings (puncta), channels that carry tears into your nose, and a small fleshy mound called the caruncle. When any of these structures gets blocked, infected, or irritated, the result is localized redness and puffiness right at the nose-side corner of your eye.
Tear Duct Infection (Dacryocystitis)
This is one of the most common causes of swelling specifically at the inner corner, and it has a distinctive signature: a tender lump forming between the inside corner of your eye and the bridge of your nose. Your tear drainage system works like a tiny plumbing network. Tears enter through openings barely 0.3 mm wide on your upper and lower eyelids, travel through narrow channels, collect in a small sac (about the size of a grain of rice), and then drain down into your nasal cavity. When any part of that pathway gets blocked, tears pool and stagnate, and bacteria can multiply in the standing fluid.
A tear duct infection typically causes pain, swelling, and redness or skin darkening around the inner eye. You may notice a mucus-like discharge, and pressing on the swollen area can sometimes push pus back up through the tear drainage opening. Acute infections tend to be painful, while chronic blockages often show up as painless but persistent gooey discharge. Adults over 40 are more prone to this, and risk factors include prior nasal or facial injuries, sinus infections, and unusual nasal anatomy.
Stye or Chalazion Near the Inner Corner
A stye (hordeolum) is a small, painful, infected bump on the eyelid caused by a blocked oil gland that picks up bacteria. A chalazion starts the same way but without infection, forming a firm, usually painless nodule. Both can occur anywhere along the eyelid margin, including close to the inner corner. In the first day or two, they look nearly identical: a red, tender, swollen spot on the eyelid.
After a couple of days, they diverge. A stye stays painful and stays right at the eyelid edge. A chalazion migrates slightly into the body of the eyelid and becomes a small, firm, nontender lump. When either one sits close to the inner corner of the lower eyelid, it can be tricky to tell apart from a tear duct infection. The key difference is location: a stye or chalazion centers on the eyelid itself, while a tear duct infection centers below the inner corner, closer to the side of the nose.
Conjunctivitis (Pink Eye)
Redness and swelling concentrated at the inner corner can also come from conjunctivitis, especially bacterial forms that produce thick discharge. That discharge tends to collect in the inner corner overnight, forming a crust that can glue your eyelids shut by morning. Viral conjunctivitis usually starts in one eye and produces more watery tearing, while bacterial conjunctivitis tends to produce thicker, yellowish discharge.
Allergic conjunctivitis is another possibility, particularly if you notice intense itching along with the redness. It almost always affects both eyes and often comes with sneezing and a runny nose. If only one eye is red and swollen, allergies are less likely to be the cause.
Irritated Pinguecula
A pinguecula is a small yellowish raised spot on the white of your eye, typically on the inner side closest to your nose. Many people have one without knowing it. When it becomes irritated, a condition called pingueculitis, it can flare up with redness, watering, and a gritty feeling right at the inner corner. Wind, dust, dry air, and UV exposure are common triggers. The redness in this case sits on the surface of the eyeball itself rather than on the eyelid or skin beside the nose, which helps distinguish it from the other causes.
What You Can Do at Home
For styes, chalazia, and mild tear duct irritation, warm compresses are the first-line treatment. The most effective approach, based on clinical evidence, is applying a moist-heat eye mask or clean warm washcloth to the closed eye for 10 minutes once a day. If that’s hard to fit into your schedule, 5 minutes twice a day works comparably well. The warmth helps soften blockages in oil glands and tear ducts, encouraging them to open and drain. Microwavable eye masks hold heat more consistently than a washcloth, which cools quickly.
Avoid squeezing or pressing hard on any bump near your eye. Keep the area clean, and if you wear contact lenses, switch to glasses until the swelling resolves. For allergic irritation, rinsing your eyes with preservative-free artificial tears can flush out allergens and soothe the surface.
Signs That Need Prompt Attention
Most causes of inner-corner redness are minor and resolve on their own or with simple warm compresses. But the structures in this area sit close to the eye socket, and infections here can occasionally spread deeper. A tear duct infection that worsens, for example, can progress to a more serious infection of the tissue surrounding the eye, causing the eyeball to push forward, severe restriction of eye movement, and significant swelling of the membranes covering the eye.
Seek care promptly if you notice any of the following:
- Vision changes, including blurriness or loss of vision in the affected eye
- Severe or worsening pain, especially pain with eye movement
- Fever along with the swelling
- The eye bulging forward or difficulty moving it normally
- Swelling that spreads beyond the inner corner across the eyelid or cheek
- No improvement after a few days of warm compresses, or progressive worsening
Unilateral redness, meaning only one eye is affected, deserves a bit more attention than bilateral redness, since the more serious causes tend to involve a single eye. If the swelling came on after an injury, or if you recently had nasal or eye surgery, that also lowers the threshold for getting it checked.