Small bumps behind the ears are extremely common and usually harmless. The area behind your ear (called the postauricular region) contains hair follicles, oil glands, lymph nodes, and skin folds that make it prone to several types of lumps, from clogged pores to swollen lymph nodes. What’s causing yours depends on how the bump feels, how long it’s been there, and whether it hurts.
Swollen Lymph Nodes
The most common cause of small bumps behind the ear is reactive lymphadenopathy, which is a clinical way of saying your lymph nodes are doing their job. You have a cluster of lymph nodes just behind each ear, and they swell when your immune system is fighting something off. Common colds, sinus infections, ear infections, and upper respiratory viruses (rhinovirus, adenovirus, influenza) all trigger this response. So can bacterial skin infections near the scalp or ear.
Swollen lymph nodes typically feel like small, rubbery, moveable bumps under the skin. They’re often tender to the touch and may appear on one or both sides. In most cases, they shrink back to normal within two to three weeks as the underlying infection clears. If a node keeps growing, becomes very firm or fixed in place, or persists for more than a month without an obvious cause, that warrants medical evaluation.
Cysts
Epidermoid cysts are another frequent culprit. These form when the opening of a hair follicle gets plugged, trapping skin cells beneath the surface. They range from about half a centimeter to several centimeters and feel like a firm, compressible lump under the skin. Many have a small dark dot (called a punctum) at the center. They grow slowly, don’t usually hurt, and can sit unchanged for months or years.
If an epidermoid cyst ruptures under the skin, it can become red, swollen, and tender, mimicking a boil. A ruptured cyst sometimes releases a foul-smelling, yellowish, cheese-like material. At that point it looks angry, but it’s still not dangerous. Most epidermoid cysts are completely random. Occasionally they’re linked to skin trauma, UV exposure, or HPV infection, but in the vast majority of cases there’s no identifiable trigger.
Acne and Clogged Pores
The skin behind your ears has plenty of oil glands and hair follicles, making it a surprisingly common spot for breakouts. Blackheads, whiteheads, and small pimples can cluster in the crease where your ear meets your head, especially if you wear glasses, earbuds, or headphones that trap sweat and oil against the skin. These bumps are usually tiny, slightly tender, and may come and go.
Keeping the area clean helps, but aggressive scrubbing can irritate the skin and make things worse. A gentle cleanser when you shower, and wiping down anything that presses against that area regularly, is usually enough.
Seborrheic Dermatitis
If the bumps are accompanied by flaky, greasy, or scaly skin, seborrheic dermatitis is a likely explanation. This inflammatory skin condition favors oily areas of the body, and the area behind the ears is one of its most common locations. You might notice white or yellowish flaking, mild redness, and itching that comes and goes. The bumps in this case are more like raised, scaly patches than distinct lumps.
Seborrheic dermatitis is chronic but manageable. It tends to flare during cold weather, periods of stress, or when you’re run down. Over-the-counter medicated shampoos containing zinc or selenium can help when worked into the affected area, since the condition is driven by the same yeast overgrowth that causes dandruff on the scalp.
Lipomas
A lipoma is a benign growth made of fat cells. Behind the ear, it shows up as a soft, doughy lump that you can push around under the skin with your finger. Lipomas grow very slowly, don’t hurt, and are almost never a medical concern. They’re more of a cosmetic nuisance than anything else. If one bothers you, it can be removed with a simple procedure, but there’s no medical reason it needs to come out.
Bone Growths
Less commonly, you might feel a hard, immovable bump that seems to be part of the bone itself. Bony growths called exostoses can develop near the ear canal, particularly in people who spend a lot of time in cold water. Surfers, swimmers, and kayakers in their 30s and 40s are the typical demographic. These growths are firm, nodular, and painless, and they develop so slowly you may not notice them for years. Men are affected more often than women, likely because of higher rates of cold-water sports participation. In the general population, these growths are rare.
Signs That Need Attention
Most bumps behind the ear resolve on their own or stay harmlessly in place. But certain features suggest something more serious is going on. Mastoiditis, an infection of the mastoid bone directly behind the ear, causes significant pain, fever, redness, and warmth over the bone, and the ear itself may stick out noticeably from the head. This is more common in young children, often following an ear infection, and requires prompt treatment.
When you’re assessing a bump at home, pay attention to a few key characteristics. Note the location, whether it’s soft or firm, moveable or fixed, painful or painless, and whether the overlapping skin looks normal or red. A bump that’s soft and moveable is almost always benign. One that’s rock-hard, fixed to underlying tissue, growing steadily, or accompanied by high fever and severe pain deserves a closer look from a professional.
How to Tell What Yours Might Be
- Small, rubbery, and tender: likely a swollen lymph node, especially if you’ve been sick recently.
- Firm with a central dark dot: likely an epidermoid cyst.
- Tiny and clustered in the skin fold: likely acne or clogged pores.
- Flaky, scaly patches with itching: likely seborrheic dermatitis.
- Soft, doughy, painless, and moveable: likely a lipoma.
- Hard and immovable, like bone: possibly an exostosis, especially if you swim or surf in cold water.
- Painful with fever, redness, and ear protrusion: possibly mastoiditis, which needs prompt care.