The most common cause of a bump inside your nostril is an infected hair follicle, a condition called nasal vestibulitis. The area just inside your nose contains small hairs, and when those follicles get irritated or infected, they form pimple-like bumps that can be surprisingly painful. Less commonly, bumps in the nostril can be nasal polyps, cysts, or in rare cases, something that needs more thorough evaluation.
Infected Hair Follicles: The Most Likely Cause
The inside of your nostril, called the nasal vestibule, is lined with skin and fine hairs. When bacteria get into one of those hair follicles, it swells into a bump that looks and feels like a pimple. Staphylococcus bacteria are the usual culprit, and they often get introduced through nose picking, excessive nose blowing, or plucking nasal hairs. You might also develop one after a cold, when constant tissue use leaves the skin raw.
Symptoms of nasal vestibulitis include a tender or painful bump just inside the nostril, swelling, redness, itching, and yellow crusting or scabbing around the opening of your nose or along the septum. In mild cases, the bump resolves on its own within a few days. Applying a warm, damp cloth to the outside of your nose for a few minutes several times a day can help ease discomfort and encourage the bump to drain naturally. Avoid squeezing it, since that pushes bacteria deeper into the tissue.
If the bump doesn’t improve after a week, grows larger, or becomes increasingly painful, a doctor can prescribe a topical antibiotic ointment applied inside the nostril twice daily for about five days. For more stubborn infections that develop into a larger, deeper boil (called a furuncle), oral antibiotics may be needed.
Why You Should Never Squeeze a Nasal Boil
This isn’t just general advice. The veins in your nose drain into a network of blood vessels that connect directly to a critical area at the base of your brain. An untreated or improperly squeezed nasal boil, particularly one in the area between the corners of your mouth and the bridge of your nose, can in rare cases spread infection through these veins and cause a serious condition called cavernous sinus thrombosis, a blood clot in the veins behind the eye.
This complication is rare, but it’s a medical emergency. Warning signs include high fever, severe headache, swelling around the eyes, vision changes like double vision or difficulty moving your eyes, and facial numbness. If a nasal bump is accompanied by any of these symptoms, seek care immediately.
Nasal Polyps
If the bump you’re feeling is soft, painless, and sits deeper inside your nose rather than near the opening, it could be a nasal polyp. These are noncancerous growths on the lining of your nasal passages or sinuses, often described as looking like peeled grapes. They develop from chronic inflammation, typically in people with ongoing allergies, asthma, or recurrent sinus infections. About 0.65% of people worldwide have polyps associated with chronic sinus problems.
A single small polyp usually causes no symptoms at all. Larger polyps or clusters of them can block airflow through your nose, reduce or eliminate your sense of smell and taste, cause a persistent runny or stuffy nose, and lead to snoring. Unlike an infected follicle, polyps don’t hurt. If you’re noticing a painless soft lump inside your nose along with a gradually worsening stuffy nose or lost sense of smell, polyps are worth investigating. An ENT specialist can look inside your nasal passages with a thin, flexible camera to confirm the diagnosis.
Cysts and Other Growths
Less commonly, bumps inside the nose can be dermoid cysts, which are slow-growing, painless lumps that contain skin cells and sometimes hair or other tissue. These tend to appear at the nasal tip or along the septum and grow gradually over months. They’re typically firm, smooth, and nontender. Dermoid cysts don’t resolve on their own and are removed surgically, but they’re benign.
Other possibilities include small benign bony growths called osteomas, or inverted papillomas, which are wart-like growths caused by tissue folding inward. These are uncommon but generally require removal because some types can recur or, rarely, become precancerous over time.
When a Bump Could Signal Something Serious
Cancerous growths inside the nose are rare, but they do occur. The National Cancer Institute lists specific warning signs to watch for: a lump or sore inside the nose that doesn’t heal, recurring nosebleeds from one side only, and persistent nasal congestion that affects just one nostril. These symptoms overlap with common conditions, so having one doesn’t mean cancer is likely. But a bump that persists for weeks without improving, keeps growing, bleeds easily, or is accompanied by unexplained facial numbness or pain warrants an evaluation.
Diagnosis typically involves a CT scan, which shows bony detail clearly, or an MRI, which is better at distinguishing soft tissue and identifying whether a growth has spread. In about 80% of sinonasal cancers, imaging reveals some bone involvement at the time of initial evaluation. A biopsy is often needed because imaging alone can’t reliably tell certain benign growths apart from malignant ones.
Sorting Out What You’re Dealing With
Location and pain are the two quickest ways to narrow down your bump. A painful bump right at the opening of your nostril, especially one that looks like a pimple or has crusting around it, is almost certainly an infected follicle. A painless, soft, grape-like mass deeper inside the nose points toward a polyp. A firm, smooth, slowly growing lump that doesn’t hurt suggests a cyst. And a bump that bleeds, ulcerates, or won’t heal over several weeks needs professional evaluation regardless of how it feels.
Most nasal bumps fall into the first category and clear up within a week or two with basic care: warm compresses, keeping your hands away from your nose, and letting the area heal. If you’ve had the bump for more than two weeks, if it’s getting worse instead of better, or if you’re experiencing changes in your breathing or sense of smell, those are good reasons to get it looked at.