Sun spots: why they appear, how to prevent them, and how to fade them

Reviewed by Souad Charifi Hadj, registered pharmacist no. 2676.

Sun spots are accumulations of melanin that appear in areas most exposed to the sun—face, décolletage, hands, and shoulders—as the skin's response to ultraviolet radiation. They are benign in the vast majority of cases, but also persistent: once they appear, they are hard to get rid of. The good news is that they can be prevented with sun protection and attenuated with active ingredients that natural cosmetics have wisely adopted. In this article, we explain, without hype and with scientific evidence, why sun spots appear, how to avoid them, and which ingredients truly help to fade them.

And yes, we're writing this in the middle of July on purpose: summer is the season when these spots become more visible and when their prevention is most crucial. Let's get to it.

What exactly are sun spots?

Sun spots are darker areas of skin caused by a localized excess of melanin, the pigment that protects us from the sun. When ultraviolet radiation repeatedly hits the skin, melanocytes (the cells that produce melanin) become overactive and deposit pigment irregularly. The result is those flat, brown or brownish marks that appear precisely where we've had the most sun exposure over the years.

It's important to distinguish between the main types of spots, because not all are treated the same way:

Solar lentigines (the classic "age spots")

These are flat, well-defined, light to dark brown spots that appear on the face, back of the hands, décolletage, and shoulders. They are due to accumulated sun exposure throughout life and are completely benign, although more common after age 40. According to DermNet, solar lentigines are harmless but permanent lesions caused by chronic UV damage.

Melasma

These are spots with more diffuse, usually symmetrical borders, appearing mainly on the forehead, cheeks, and upper lip. Here, a hormonal factor (pregnancy, contraceptives) comes into play in addition to the sun, which is why it affects women much more. The Spanish Academy of Dermatology and Venereology (AEDV) emphasizes that melasma has "extreme sun sensitivity" and that its treatment must be continuous and year-round, not just in summer.

Post-inflammatory hyperpigmentation

This is the dark mark left after a pimple, chafing, or irritation. The sun aggravates it and makes it more stubborn, which is why acne-prone skin must pay special attention to sun protection.

Why do sun spots appear?

The short answer: because of the sun. The nuanced answer is more interesting. Ultraviolet radiation generates oxidative stress in the skin and damages the DNA of melanocytes. As a defense mechanism, these cells produce more melanin to try to stop the damage. The problem is that, over the years, this production becomes disorganized: instead of an even tan, specific accumulations of pigment form, which we perceive as spots.

Several factors accelerate this process: unprotected sun exposure (by far the most important), aging, genetic predisposition, hormonal changes, and certain skin types. And a key detail often overlooked: UVA radiation penetrates clouds and glass, so the skin continues to receive pigmentary stimulation even on cloudy days or while driving or working next to a window.

How to prevent sun spots

If you take only one idea from this article, let it be this: prevention is infinitely easier than correction. And prevention has one name: photoprotection.

The AEDV and its Healthy Skin Foundation make it clear: photoprotection is the basic pillar for preventing and stopping accumulated damage, and the most vulnerable skin types need high-tolerance formulas and a very high SPF. However, they also warn of something not always said: no photoprotector blocks 100% of radiation, so cream is essential but not infallible, and should be accompanied by other habits.

These are the preventive measures that truly make a difference:

• Broad-spectrum sunscreen (UVA+UVB) SPF 30 or higher, daily, even in winter and on cloudy days. Reapply every two hours if outdoors.
• Avoid direct sun exposure during peak hours, approximately between 12:00 PM and 4:00 PM, when radiation is most intense.
• Physical barrier: wide-brimmed hat, sunglasses, and clothing that covers the most exposed areas.
• Antioxidants in the morning, such as vitamin C, which help neutralize some of the oxidative stress that light generates in the skin and enhance the effect of photoprotection.
• Consistency all year round. Especially with melasma, neglecting sun protection for a couple of summer weeks can ruin months of effort.

Natural active ingredients that help to lighten sun spots

Here comes the part we like best: yes, there are natural ingredients with reasonable evidence to fade spots. A systematic review published in The Journal of Clinical and Aesthetic Dermatology concluded that active ingredients such as arbutin, licorice extracts, niacinamide, and ascorbic acid (vitamin C) showed efficacy as depigmenting agents, although it warns that many studies are short and more long-term data are needed. With that honesty upfront, these are the protagonists:

Vitamin C

It's the star antioxidant. It helps to brighten, evens skin tone, and acts on melanin synthesis, in addition to strengthening protection against sun damage when used in the morning. It is one of the most studied active ingredients in cosmetics, with derivatives such as MAP (magnesium ascorbyl phosphate) that have shown a lightening effect.

Niacinamide (vitamin B3)

It is one of the active ingredients with the best evidence-to-tolerance ratio. The classic study by Hakozaki et al., published in the British Journal of Dermatology, showed that niacinamide reduces the transfer of melanosomes (pigment "packets") to skin cells by 35 to 68%, and that when applied at 5% twice daily for four weeks, it significantly reduced spots. The interesting thing is that it acts through a different pathway than other depigmenting agents, so it combines very well with them.

Licorice (glabridin)

Licorice extract contains glabridin, a compound that inhibits tyrosinase, the key enzyme in melanin production. Research compiled in reviews on natural depigmenting agents attributes a remarkable ability to curb this enzyme, and some clinical studies with licorice extract have shown improvement in melasma. It is also a very well-tolerated ingredient.

Alpha-arbutin

Derived from bearberry, it also acts on tyrosinase by progressively releasing its action. An improvement in skin tone uniformity is usually noticed after several weeks of consistent use. It combines particularly well with niacinamide, as they work through complementary mechanisms.

Gentle exfoliation with AHAs

Acids like glycolic or lactic acid promote cell renewal and help to remove superficial pigment faster. Used wisely and always with sun protection, they accelerate the improvement of skin tone. Be careful: over-exfoliation irritates, and irritated skin pigments more, so less is more.

An important and honest warning: no cosmetic product "erases" an established spot like a laser would. What these active ingredients do is attenuate, unify, and prevent with consistency. We are talking about weeks or months of regular use, not weekend miracles.

And if your spots are not from the sun, or you already have them and want to lighten them, we discuss this in depth in facial spots: how to lighten them, where we review each type of spot and the active ingredient that works best for it.

A simple routine against spots

You don't need a fifteen-step ritual. A well-planned routine is sufficient:

• In the morning: gentle cleansing → antioxidant serum with vitamin C → moisturizer → SPF 30-50 sunscreen. Sunscreen is the non-negotiable step.
• At night: cleansing → depigmenting active (niacinamide, licorice, or alpha-arbutin) → moisturizer. A couple of nights a week, you can incorporate a gentle AHA exfoliation.

The magic word is consistency. A modest routine maintained for six months wins hands down over a perfect routine that you abandon in two weeks.

When to see a dermatologist?

Sun spots are benign, but the skin deserves monitoring. It's advisable to consult a professional if a spot changes in size, shape, or color, has irregular borders, mixes several tones, itches, bleeds, or doesn't heal. For any evolving lesion or one that raises doubts, a dermatological review is the sensible decision: cosmetics care for and prevent, but do not replace a medical diagnosis. And in cases of resistant melasma or very pronounced spots, a dermatologist can assess treatments like peels or lasers that go beyond what a home routine offers.

In summary

Sun spots are the mark the sun leaves on the skin over the years. They are prevented with daily sun protection and sensible habits, and attenuated with patience using active ingredients such as vitamin C, niacinamide, licorice, or alpha-arbutin. Conscious beauty is precisely this: understanding what is happening to your skin and supporting it with effective and respectful ingredients.

If you want to start, at Biovardi you can explore our selection of natural cosmetics for spots and pigmentation, reinforce prevention with a good natural sunscreen, incorporate a facial treatment serum with depigmenting active ingredients, and add luminosity to your skin with our luminosity and glow collection. If you have questions about what to choose for your skin type, our pharmaceutical team is a WhatsApp message away.

Frequently asked questions about sun spots

Can sun spots be removed permanently?

Superficial spots can be greatly attenuated with consistency and good active ingredients, but completely "erasing" them usually requires dermatological treatments like lasers or peels. Cosmetics fade them and, above all, prevent new ones from appearing.

How long does it take to see improvement?

It depends on the active ingredient and the spot, but as a reference, changes in tone begin to be seen after 4-8 weeks of daily use, and older spots may need three months or more.

Do I need to use sunscreen even if I already have spots?

Yes, it is the most important step. Without sun protection, any depigmenting treatment is swimming against the current, because the sun continues to stimulate melanin production. No cream blocks 100% of radiation, so protection must be daily and year-round.

Can I use vitamin C and niacinamide at the same time?

Yes. They can be combined without problem: vitamin C is better suited for the morning as an antioxidant, and niacinamide is very well tolerated at any time. They work through different mechanisms, so they complement each other.

Do bakuchiol or retinol help with spots?

Yes, vitamin A derivatives promote cell renewal and help even out skin tone. Bakuchiol is a very interesting natural alternative for sensitive skin that cannot tolerate retinol.

Are sun spots dangerous?

In the vast majority of cases, they are benign and only an aesthetic concern. However, any spot that changes in appearance, has irregular borders, mixes colors, or bleeds should be checked by a dermatologist.

References

• Fundación Piel Sana (AEDV) — Fotoprotección: aedv.fundacionpielsana.es/wikiderma/fotoproteccion
• AEDV — Manchas: lo último para combatirlas: aedv.es
• DermNet — Solar lentigo: dermnetnz.org/topics/solar-lentigo
• Hakozaki T. et al. (2002), British Journal of Dermatology — The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer: onlinelibrary.wiley.com
• Are Natural Ingredients Effective in the Management of Hyperpigmentation? A Systematic Review — JCAD (PMC): pmc.ncbi.nlm.nih.gov/articles/PMC5843359
• Cosmeceuticals for Hyperpigmentation: What is Available? (PMC): pmc.ncbi.nlm.nih.gov/articles/PMC3663177