Age spots are flat, oval patches of darker skin, typically tan to dark brown, that range from about 3 to 20 millimeters across. They show up on areas that have gotten the most sun exposure over your lifetime: the backs of your hands, face, shoulders, upper back, and tops of your feet. They’re completely harmless, but because they can sometimes resemble more serious skin changes, knowing exactly what a normal age spot looks like matters.
Color, Shape, and Size
A typical age spot is a flat mark, level with the surrounding skin, with no raised edges or bumpy texture. The color ranges from light tan to dark brown, and occasionally nearly black in deeper skin tones. The key feature is that each individual spot has a uniform color throughout. If you look at a single age spot, it should be more or less the same shade from edge to edge.
Most age spots are oval or round with well-defined, smooth borders. They can be as small as a freckle (around 3 mm) or grow to roughly the size of a dime (20 mm). Several spots often cluster together in the same area, which can make them look larger or more irregular than they actually are. When you run your finger over one, it feels the same as the rest of your skin. There’s no roughness, scaliness, or elevation.
Where They Appear
Age spots are a direct result of cumulative UV exposure, so they show up almost exclusively on skin that has spent decades in the sun. The backs of the hands are the single most common location, followed by the face (especially the forehead and cheeks), shoulders, upper back, and forearms. The tops of the feet are another frequent site for people who wear sandals or go barefoot outdoors regularly.
You won’t typically find age spots on skin that stays covered, like your torso or inner arms. If a dark spot appears in a sun-protected area, it’s worth having it evaluated since it’s less likely to be a standard age spot.
What Causes Them
Your skin contains pigment-producing cells that darken in response to UV light, which is the same process behind a tan. After years of repeated sun exposure, some of these cells become permanently overactive. The surrounding skin cells essentially get “stuck” sending signals that keep pigment production running at full speed, even when you’re not in the sun. The result is a small patch where pigment clumps together in higher concentration than the skin around it.
Tanning beds cause the same effect. Age spots aren’t actually tied to aging itself. They’re tied to accumulated UV damage, which is why people with decades of sun exposure or tanning bed use develop them earlier and in greater numbers.
Age Spots vs. Raised Brown Spots
Many people confuse age spots with another extremely common skin growth called a seborrheic keratosis. Both tend to appear in older adults on sun-exposed skin, and both are harmless. The difference is texture. Age spots are completely flat and smooth. Seborrheic keratoses are raised, with a waxy or “stuck-on” appearance, and their surface often looks rough or warty.
If a brown spot you’ve been calling an age spot starts to thicken, develop a crusty surface, or feel like it’s sitting on top of the skin rather than within it, it’s more likely a seborrheic keratosis. These are still benign, but knowing the difference helps you track what’s normal on your skin.
When a Spot Might Not Be an Age Spot
The real concern with any dark skin mark is whether it could be melanoma. The American Academy of Dermatology uses the ABCDE criteria to distinguish warning signs from harmless spots:
- Asymmetry: One half of the spot looks different from the other half. Age spots are symmetrical.
- Border: The edges are irregular, scalloped, or blurry. Age spots have clean, well-defined borders.
- Color: The spot contains multiple colors, like mixtures of tan, brown, black, white, red, or blue. Age spots are a single uniform shade.
- Diameter: The spot is larger than 6 mm (about the size of a pencil eraser), though melanomas can be smaller.
- Evolving: The spot is changing in size, shape, or color over weeks or months.
A true age spot fails none of these tests. It’s symmetrical, evenly bordered, one color, and stable over time. Any spot that hits even one of these criteria deserves a closer look from a dermatologist.
Fading and Treating Age Spots
Age spots don’t fade on their own. Once the pigment-producing cells in that area become chronically overactive, they stay that way. But several treatments can lighten them significantly.
Prescription-strength lightening creams containing hydroquinone (4%) typically show initial lightening within 3 to 6 weeks, with more noticeable fading of deeper pigmentation by 8 to 12 weeks. Azelaic acid works more gradually: you may see almost no change in the first month, a 30% to 40% reduction by 6 to 8 weeks, and 70% to 80% improvement by 12 to 16 weeks.
For faster results, laser treatments offer higher clearance rates. Picosecond lasers clear roughly 68% to 93% of treated spots, while older Q-switched lasers achieve 36% to 77% clearance. These results vary with skin tone, spot depth, and the number of sessions.
Preventing New Spots
Since age spots are driven by cumulative UV damage, daily broad-spectrum sunscreen is the most effective prevention. Tinted formulas offer an additional advantage because the iron oxides in the tint help block visible light, which can also trigger pigment production. Sunscreen also keeps existing spots from darkening further, so even if you’re treating current spots, skipping sun protection can undo the progress.
Protective clothing, wide-brimmed hats, and staying out of peak midday sun all reduce the UV load on your skin. None of this reverses spots you already have, but it slows the arrival of new ones considerably.