A nose infection typically shows up as redness, swelling, and crusting in or around the nostrils, sometimes with pimple-like bumps or painful sores. The exact appearance depends on whether the infection is bacterial, viral, or fungal, and whether it’s affecting the skin around the nostrils or the deeper sinus passages. Here’s how to tell what you’re looking at.
Bacterial Infections Around the Nostrils
The most common visible nose infection is nasal vestibulitis, a bacterial infection in the hair-bearing area just inside the nostrils. It’s caused by Staphylococcus aureus in most cases. The hallmark signs include redness and swelling around the nostril opening, small pimple-like bumps or boils that may be filled with pus, and yellow crusting or scabbing around the septum (the tissue dividing your nostrils). The sores often look like angry red pimples, and they can be quite painful to touch.
In more developed cases, the infection can spread to the nasal tip. One documented case involved a woman whose nasal tip became visibly swollen and red with a central punctum (a small visible opening where pus can drain) and crusting over the right nostril. That infection had progressed to a nasal tip abscess.
When staph bacteria cause impetigo around the nose, you’ll see fluid-filled blisters that rupture and leave behind a distinctive yellow or honey-brown crust. This is especially common around the mouth and nose, and it’s highly contagious.
Viral Sores Inside the Nose
Herpes simplex virus can infect the nose, producing clusters of small blisters (vesicles) that eventually break open into shallow ulcers. These ulcers may develop a yellow crust from the fluid that seeps out. In severe cases, herpes infections on the nose can cause hemorrhagic (bloody) crusting, dark black tissue called eschar, and surrounding redness that extends across the nasal tip and up the bridge of the nose. This looks dramatically different from a simple pimple: the tissue appears raw, dark, and damaged rather than just swollen.
The key visual difference between bacterial and viral sores is pattern. Bacterial infections tend to appear as isolated bumps or boils. Viral herpes sores cluster together and evolve from blisters to open ulcers to crusted lesions over the course of several days.
What Mucus Color Actually Tells You
Many people assume green or yellow mucus means a bacterial infection, but that’s not reliable. Both viral and bacterial infections change mucus color and consistency in similar ways. During a common cold, nasal mucus typically starts watery and clear, then gradually thickens and turns yellow or green over several days as your immune system ramps up.
One useful timing clue: thick, colored mucus that appears right at the start of an illness is more suggestive of a bacterial infection. With a viral cold, the mucus usually doesn’t thicken and change color until a few days in. But color alone isn’t enough to distinguish the two.
Sinusitis: What Happens Deeper Inside
When infection reaches the sinuses (the air-filled cavities behind your forehead, cheeks, and eyes), you won’t see much from the outside. Acute sinusitis causes the sinus lining to become inflamed and swollen, which blocks normal mucus drainage. The main signs are facial pressure or pain, a stuffed-up nose, and thick nasal discharge. You might notice puffiness around the eyes or cheeks, but the real inflammation is happening internally.
Sinusitis is most often triggered by a common cold. The visible clues are indirect: persistent thick discharge from the nose, reduced sense of smell, and sometimes post-nasal drip that causes a sore throat or cough.
Fungal Infections: The Most Serious Visual Warning
Invasive fungal infections of the nose are rare but dangerous, occurring almost exclusively in people with weakened immune systems. The signature visual sign is a progressive darkening of nasal tissue, starting as discoloration on the skin or inside the nasal cavity and advancing to black, dead tissue (eschar). Internally, a doctor examining the nasal cavity with a scope would see extensive necrotic (dead) tissue along the lining, the nasal structures, and the cartilage of the septum.
If you notice darkening or blackening skin on or around your nose, especially if you have diabetes, are on immunosuppressive medications, or are undergoing chemotherapy, this needs emergency evaluation.
Signs an Infection Is Spreading
Most nasal infections stay localized and resolve with treatment. Complications like abscesses, scarring, or spread to surrounding structures are rare and more likely in people with compromised immune systems. But certain warning signs indicate the infection has moved beyond the nose.
The most concerning scenario is when a nasal infection spreads to the eye socket, a condition called orbital cellulitis. This causes swelling from the eyebrow to the cheekbone, redness or discoloration around the eye, a bulging eye, pain when trying to move the eye, and impaired vision. In children, a high fever combined with eye swelling or bulging warrants an emergency room visit immediately. Left untreated, orbital cellulitis can damage the optic nerve, cause vision loss, or spread to the membranes surrounding the brain.
A nasal infection can also, in very rare cases, lead to blood clots in the cavernous sinus, a vein channel at the base of the skull. This is why infections in the central face, sometimes called the “danger triangle” between the nose and upper lip, are taken seriously even when they look minor.
How Nasal Infections Are Treated
Most bacterial nasal infections, including vestibulitis, are treated with a topical antibiotic ointment applied inside the nostrils twice daily for about five days. This approach eliminates the bacteria in roughly 91% of cases right after treatment. About 87% remain clear at four weeks. Some infections recur over time, with about half of people seeing the bacteria return within six months.
If the infection has formed an abscess (a deeper pocket of pus), it may need to be drained. Viral herpes infections are treated with antiviral medications. Fungal infections require aggressive antifungal treatment and sometimes surgical removal of dead tissue.
For a straightforward case of nasal vestibulitis, you can expect noticeable improvement within a few days of starting treatment. Keeping your hands away from the inside of your nose, not picking at crusts, and avoiding nose hair plucking or aggressive trimming all reduce the chance of recurrence.