White bumps on skin are most commonly milia, small cysts that form when dead skin cells get trapped just below the surface. But several other conditions can also cause white or light-colored bumps, from viral infections to enlarged oil glands. The appearance, size, and location of your bumps can help narrow down the cause.
Milia: The Most Common White Bumps
Milia are tiny, firm, white cysts that look like small pearls embedded in the skin. They form when dead skin cells become trapped beneath the surface instead of shedding normally. You’ll most often see them on the eyelids, forehead, cheeks, and around the nose. Unlike pimples, milia don’t have redness or inflammation around them, and squeezing them at home won’t work because the contents sit deeper than a typical whitehead.
Babies frequently develop milia at birth, especially on and around the nose. These neonatal milia resolve on their own within a few weeks and don’t need treatment. In adults, milia can stick around indefinitely. A dermatologist can remove them by puncturing each cyst with a sterile needle and extracting the contents, or by using cryotherapy to freeze them off. Topical retinoids can help when many milia are present, both reducing the number and making individual removal easier.
Milia in babies sometimes get confused with baby acne, but the timing is different. Milia are present from birth, while baby acne shows up about two weeks later and looks red and inflamed rather than white and smooth.
Keratosis Pilaris
If your white bumps are small, rough, and clustered on the upper arms, thighs, or cheeks, you’re likely looking at keratosis pilaris. This happens when a protein called keratin builds up and plugs individual hair follicles, creating a sandpaper-like texture. The bumps can appear white, skin-colored, or slightly red.
Keratosis pilaris is extremely common and harmless. It tends to be worse in dry weather and often improves with age. Regular use of moisturizers containing lactic acid or urea can soften the plugs and smooth the skin over time. Gentle exfoliation helps, but scrubbing too aggressively makes the irritation worse.
Molluscum Contagiosum
Molluscum contagiosum produces small, dome-shaped bumps that are white, pink, or flesh-colored with a characteristic dimple in the center. This is a viral skin infection spread through direct skin contact or shared items like towels. It’s traditionally considered a childhood infection, though adults can get it too, often through sexual contact.
The bumps typically disappear on their own within 6 to 12 months, though some cases take as long as 4 years to fully resolve. Because the virus spreads easily, new bumps can keep appearing even as older ones heal. Dermatologists sometimes treat persistent cases with cryotherapy or topical solutions, especially when bumps are in visible or uncomfortable areas.
Flat Warts
Flat warts are smooth, slightly raised bumps that can appear white, pink, or flesh-colored. They’re caused by specific strains of the human papillomavirus (HPV types 3, 10, 28, and 49) and tend to cluster in groups, sometimes dozens at a time. Common locations include the face, backs of the hands, and legs.
They’re smaller and smoother than the rough, raised warts most people picture. Flat warts spread through small cuts or abrasions in the skin and can take months to appear after exposure. Treatment options include cryotherapy, topical retinoids, and prescription creams that stimulate your immune system to fight the virus.
Sebaceous Hyperplasia
Sebaceous hyperplasia creates small, yellowish-white bumps with a distinctive doughnut shape. Each bump is actually a cluster of enlarged oil glands, and when you look closely, you can see what appears to be a small dip in the center. These are most common on the forehead and cheeks in middle-aged and older adults.
These bumps are completely benign, but they share a superficial resemblance with basal cell carcinoma, a common type of skin cancer. The key visual difference: basal cell carcinoma develops irregular, branching blood vessels visible on its surface and eventually ulcerates and crusts over. Sebaceous hyperplasia shows a cleaner doughnut pattern with blood vessels arranged in a radial “crown” that doesn’t cross the center of the bump. If you’re unsure, a dermatologist can distinguish between the two quickly using a dermatoscope.
White Spots That Aren’t Bumps
Two conditions produce flat white patches rather than raised bumps, but they’re worth mentioning because people often describe them as “white spots” in the same search.
Tinea Versicolor
This is a fungal overgrowth that interferes with your skin’s normal pigment production, creating patches of lighter (or sometimes darker) skin. The patches are flat, slightly scaly, and most noticeable after sun exposure when the surrounding skin tans but the affected areas don’t. It’s treated with antifungal creams or shampoos, though your skin color can remain uneven for several weeks or months after the fungus is gone.
Sun Spots (Idiopathic Guttate Hypomelanosis)
These are small, flat, white spots that develop on skin that has had years of cumulative sun exposure, most commonly the shins and forearms. They’re typically smaller than a pea, though some grow as large as a quarter. They become more common with age and are a cosmetic issue rather than a medical concern. Consistent sunscreen use can help prevent new spots from forming.
How to Tell Your Bumps Apart
- Firm, pearly, painless: Milia. No redness, no inflammation, often near the eyes.
- Rough, sandpapery clusters: Keratosis pilaris. Upper arms, thighs, or cheeks.
- Dome-shaped with a central dimple: Molluscum contagiosum. Can appear anywhere on the body.
- Smooth, flat, grouped in large numbers: Flat warts. Face, hands, or legs.
- Yellowish-white with a doughnut shape: Sebaceous hyperplasia. Forehead and cheeks in adults over 40.
- Flat patches, not raised: Tinea versicolor or sun-related pigment loss.
Most white bumps are harmless and either resolve on their own or respond well to simple treatments. The main exception to watch for is any bump that grows steadily, bleeds, crusts over, or changes shape over weeks, which warrants a closer look to rule out skin cancer.