Sun Spots (Solar Lentigines): Causes, Age Spots, Brown Spots & What Actually Helps

What sun spots actually are

Solar lentigines are flat, well-defined brown marks that develop on skin with a long history of sun exposure. Under the surface, they reflect a localised, persistent increase in melanin — and in the activity of the pigment-producing cells — in response to years of ultraviolet light. They tend to appear exactly where the sun lands most: the face, the backs of the hands, the forearms, the upper chest and the shoulders.

The everyday names are misleading. "Age spots" implies they're an inevitable part of getting older, and "liver spots" is an old misnomer with no connection to the organ. In reality, they are markers of cumulative UV exposure — which is why they can show up relatively early in people who have spent a lot of time in the sun, and why the single most useful thing you can do about them sits in the sun-protection aisle. To understand why UV drives this, it helps to know how the skin makes pigment in the first place — covered in our piece on tyrosinase, the master switch of pigmentation.

Sun spots vs freckles, melasma and PIH

"Brown spot" is not a diagnosis. Telling these apart matters, because they have different causes and respond to different approaches.

If you're trying to work out which you have — and what to do about it — our broader guide to hyperpigmentation and dark spots covers the full picture. This article focuses on the sun-driven kind.

When a "sun spot" needs checking

This is the most important section in the article. Most solar lentigines are benign. But a small number of skin cancers — in particular a form of melanoma called lentigo maligna — can begin life looking very much like an ordinary sun spot. That overlap is exactly why "it's just an age spot" is an assumption worth questioning rather than trusting.

You don't need to become your own diagnostician — and you shouldn't try to be. The point of knowing the warning features below is simply to recognise when to get a professional opinion. Dermatologists often use the ABCDE prompts: Asymmetry, irregular Borders, uneven Colour, Diameter larger than about 6 mm, and Evolving — any change over time. A spot that is new in adulthood, changing, itching, bleeding or simply different from your others is worth showing to a dermatologist.

Prevention: the sun-protection foundation

Because solar lentigines are driven by UV, sun protection is both the best prevention and the foundation of any treatment. Without it, you're working to fade spots while continuing to create and darken them. Daily broad-spectrum sun protection helps limit new spots, keeps existing ones from deepening, and protects the results of any topical or in-clinic treatment.

This applies to all skin tones. Deeper skin burns less readily, but UV still drives pigmentation and photoageing — so daily protection matters regardless of how easily you burn. For more on why, see our explainer on how melanin protects skin only partly.

What helps the appearance

For spots a dermatologist has confirmed are benign, the same evidence-based ingredients used across pigmentation can help improve their appearance — most work by easing melanin production or speeding cell turnover.

One ingredient you may read about is hydroquinone, historically the dermatological reference for fading pigment. It is now prescription-only in the US and prohibited in skin cosmetics in the EU, so it belongs to the dermatologist, not the bathroom shelf. Expect any topical approach to work gradually, over weeks to months — and to need ongoing sun protection to hold its results.

In-clinic procedures

For solar lentigines specifically, dermatological procedures can be effective — often more so than topicals alone, because lentigines are a discrete, well-defined target. Options a dermatologist might discuss include chemical peels, cryotherapy (controlled freezing), and light- or laser-based treatments such as IPL and pigment-selective lasers.

Two caveats matter. First, these are medical procedures, best chosen and performed by a qualified professional after confirming the spot is benign. Second, in deeper skin tones, some energy-based treatments carry a higher risk of triggering post-inflammatory pigmentation, so settings and technique need to be matched to the skin — another reason this is a conversation with an experienced practitioner rather than a DIY decision.

Sun Spots vs Freckles: What's the Difference?

They can look similar but behave differently. Freckles (ephelides) are usually small, strongly genetic, tend to appear in childhood, and darken in summer before fading in winter. Sun spots (solar lentigines) are typically larger, have well-defined edges, appear later as cumulative sun exposure adds up, and stay put year-round. Both are linked to UV, but freckles come and go with the seasons while solar lentigines are persistent — and it's the persistent, later-appearing marks that most people mean by "age spots."

Do Sun Spots Go Away on Their Own?

Generally, no. Unlike freckles, which fade as sun exposure drops, solar lentigines tend to be persistent and don't usually resolve on their own. Their appearance can be improved with consistent sun protection and evidence-based topicals, and dermatological procedures can be effective for confirmed-benign spots. What they won't do is disappear by themselves — and because UV keeps driving them, daily protection is what stops new ones forming and old ones darkening. If a spot does change noticeably on its own, that's a reason to see a dermatologist rather than to assume it's fading.

Can Sunscreen Prevent Sun Spots?

Daily broad-spectrum sun protection is one of the most effective ways to help prevent sun spots. Because solar lentigines are driven by cumulative UV exposure, consistent protection helps reduce the formation of new spots and limits existing spots from becoming darker over time.

Are Sun Spots Cancer?

Solar lentigines themselves are usually benign and are not skin cancer. However, some serious skin conditions, including certain skin cancers, can resemble sun spots. That is why new, changing or unusual spots should always be assessed by a qualified dermatologist.

Can Vitamin C Help Sun Spots?

Vitamin C is commonly used in pigmentation-focused skincare because of its antioxidant properties and its role in supporting a more even-looking skin tone. With consistent use alongside daily sun protection, vitamin C can help improve the appearance of sun-related pigmentation over time.

The Bottom Line: Sun Spots and Your Skin

Sun spots — solar lentigines — are the skin's long-term record of UV exposure, not an inevitable mark of age. They're distinct from freckles, melasma and post-inflammatory pigmentation, and they respond best to a sun-first approach: daily broad-spectrum protection as the foundation, then evidence-based topicals such as vitamin C, niacinamide, alpha-arbutin and retinoids to help their appearance, with in-clinic procedures available through a dermatologist.

But the most important point isn't cosmetic. Most sun spots are harmless, yet some serious skin conditions, including certain skin cancers, can resemble them — so a new, changing or unusual spot is a reason to see a dermatologist, not something to treat with a serum. Look after the cause with sun protection, improve the appearance patiently, and keep an eye on your skin. When in doubt, get it checked.