White dots or spots on skin are almost always harmless, and the most likely cause depends on their size, texture, and where they show up on your body. The five most common culprits are sun damage, a fungal overgrowth, trapped dead skin cells, an autoimmune condition called vitiligo, and a childhood condition linked to eczema. Here’s how to tell them apart and what, if anything, to do about each one.
Sun Spots That Appear With Age
The most common white spots in adults over 40 are caused by cumulative sun exposure. These small, flat white marks are called idiopathic guttate hypomelanosis, and they show up on areas that get the most UV light: forearms, shins, shoulders, and the face. They’re usually smaller than a pea, though some grow as large as a quarter. Most are round or oval with slightly irregular edges, smooth to the touch, and either lighter than the surrounding skin or completely white.
These spots form because years of sun exposure gradually damage the pigment-producing cells in small patches of skin. The number of spots tends to increase with age. They’re painless, don’t itch, and pose no health risk. Because the pigment cells in those patches are permanently altered, the spots rarely fade on their own. Dermatologists can sometimes improve their appearance with cryotherapy (controlled freezing) or laser treatments, but many people simply leave them alone.
Daily broad-spectrum sunscreen with at least SPF 30 is the most effective way to slow new spots from forming. Protective clothing, wide-brimmed hats, and avoiding direct sun between 10 a.m. and 4 p.m. also help.
Scaly Patches From a Fungal Overgrowth
If the white spots are slightly scaly and appear mostly on your chest, back, or upper arms, you’re likely looking at tinea versicolor. This is caused by a yeast that naturally lives on everyone’s skin. In warm, humid conditions, or when you sweat heavily, the yeast multiplies and produces a substance that blocks the skin’s ability to make pigment. The result is scattered patches that can range from white to tan to pink, depending on your natural skin tone.
A simple way to check: lightly scratch one of the patches with a fingernail. Tinea versicolor patches will flake or produce a fine scale. The spots themselves don’t usually itch or hurt, though some people notice mild itchiness in hot weather.
Over-the-counter antifungal creams or shampoos containing ingredients like clotrimazole or miconazole clear the infection in most cases. For widespread patches, a doctor may prescribe an oral antifungal for one to three months. One thing that catches people off guard: even after the fungus is gone, the white patches can take weeks or months to regain their normal color. The pigment returns gradually as your skin renews itself. Tinea versicolor also tends to come back, especially in summer, so some people use antifungal washes periodically as prevention.
Tiny White Bumps (Milia)
Small, hard, pearly-white bumps, especially around the eyes, nose, cheeks, or forehead, are most likely milia. These form when dead skin cells get trapped beneath the surface instead of shedding naturally. New skin grows over them, and the trapped cells harden into tiny cysts. Each one is typically only 1 to 2 millimeters across, firm to the touch, and completely painless.
Milia are extremely common in newborns but also appear in adults, often after sun damage, burns, or heavy skincare products that clog pores. They can also show up on the arms, legs, chest, and inside the mouth. Unlike pimples, milia don’t have an opening at the surface, so squeezing them won’t work and can cause scarring. Most resolve on their own over weeks to months. If they bother you cosmetically, a dermatologist can remove them quickly with a small needle or gentle extraction tool.
Vitiligo: Larger Patches of Pigment Loss
When white patches are larger, clearly defined, and spreading over time, vitiligo is the primary concern. This autoimmune condition occurs when the body’s immune system attacks and destroys its own pigment-producing cells. The patches are smooth (not scaly or raised), completely white rather than just lighter, and tend to appear first on the hands, face, and around body openings like the eyes, nostrils, and mouth.
Vitiligo affects roughly 1% of the population and can start at any age, though it often appears before 30. The patches may stay stable for years or gradually expand. People with vitiligo are more likely to have other autoimmune conditions, including thyroid disorders. A dermatologist can usually diagnose it by examining the skin under a special UV lamp, sometimes confirmed with blood tests or a skin biopsy.
Treatment focuses on restoring pigment or evening out skin tone. Options range from prescription creams that calm the immune response in affected areas to light therapy that stimulates pigment cells. Results vary significantly from person to person, and repigmentation is often slow, taking months of consistent treatment.
Pale Patches in Children
In kids, the most common cause of white spots is pityriasis alba, which produces round or oval patches of lighter skin, typically on the face, upper arms, or neck. Each patch can be up to an inch across, slightly raised, dry, and lightly scaly. The patches often start as faintly pink or red spots before fading to a near-white color that stands out more on darker skin tones.
Pityriasis alba is closely linked to eczema and atopic dermatitis. Children with a family history of asthma, eczema, or hay fever are more likely to develop it. The condition is harmless and resolves on its own, though it can take months or even a couple of years. Keeping the skin moisturized and using gentle, fragrance-free products helps reduce dryness and makes the patches less noticeable.
How to Tell These Conditions Apart
- Smooth and flat, pea-sized or smaller, on sun-exposed skin: likely sun-related white spots, especially if you’re over 40.
- Scaly when scratched, on the trunk or upper body: likely tinea versicolor.
- Tiny, hard, raised bumps around the eyes or face: likely milia.
- Large, bright white, smooth patches that spread: likely vitiligo.
- Dry, slightly scaly patches on a child’s face: likely pityriasis alba.
A few less common conditions can also cause white spots. Progressive macular hypomelanosis looks similar to tinea versicolor but without any scale. Morphea causes hardening of the skin more than color change. Lichen sclerosus, which typically affects the genital area, can produce white patches along with cracking or soreness.
Spots That Deserve a Closer Look
The vast majority of white spots are benign, but certain features warrant attention. A spot or mark that changes in size, shape, or color over weeks should be evaluated. The same goes for any spot that bleeds, becomes crusty, feels persistently sore or itchy, or looks noticeably uneven in shape or color. A dark streak under a fingernail or toenail that wasn’t caused by an injury is also worth getting checked. These features don’t necessarily point to anything serious, but a dermatologist can rule out rare concerns like amelanotic melanoma, a form of skin cancer that sometimes appears as a pale or skin-colored mark rather than the typical dark mole.
Any new or unusual mark that hasn’t resolved after a few weeks is reasonable to have examined, particularly if it doesn’t fit the patterns described above.