Sunspots on the Face: How to Prevent and Reduce Them

After returning from vacation or during the first spring sunshine, you may notice dark, irregular patches appearing on your face. These are sunspots, one of the most visible manifestations of the impact of ultraviolet rays on the skin.

We have already addressed the topic of facial skin discoloration as a whole, including hormonal forms such as melasma. Here, we focus on the direct link between solar radiation, melanogenesis, and photoaging.

Article written by Elisa Avalle, founder of LeLang Skin Care and a dermocosmetics specialist. Cover image generated with the support of artificial intelligence.

[INDICE:h2]

What they are and why they form

Sunspots, or solar lentigines, are well-defined focal areas of hyperpigmentation, ranging in color from hazelnut to dark brown, that appear on the most exposed areas: the forehead, cheekbones, upper lip, backs of the hands, and décolleté.

One useful distinction: unlike freckles, which darken in summer and lighten in winter, sunspots are permanent if untreated and tend to become more pronounced as exposure accumulates.

When UVA and UVB rays penetrate the epidermis, they damage cellular DNA and generate free radicals. To protect the cells' nuclei, melanocytes activate the enzyme tyrosinase, which is responsible for melanin synthesis.

Melanin is then transferred to the superficial keratinocytes, giving rise to a tan. But when exposure is prolonged or unprotected, production becomes hyperactive and disordered: melanocytes continue producing pigment even after exposure has ended, accumulating it in specific areas.

UV damage is cumulative. The spots that appear at age 30 or 40 are often the result of sunburns and reckless exposure during childhood or adolescence. This is why protecting children is an investment in their adult skin.

How to prevent sunspots on the face

They can be prevented in only one way: applying a broad-spectrum SPF 50+ sunscreen every day of the year, reapplying it every two hours in case of direct exposure, and pairing it with an antioxidant in the morning. Everything else comes later.

Many people consider sunscreen a beach product, but UVA rays — directly responsible for premature aging and hyperpigmentation — maintain a constant intensity throughout the year, passing through clouds and the glass of windows and cars.

For more information on choosing a sunscreen, see the guide to the best facial sunscreen.

It is helpful for it to be enriched with antioxidants, which can neutralize free radicals that induce tyrosinase.

Habits that make a difference

• Apply sunscreen several times a day, not just in the morning;
• Stay in the shade during peak hours, between 10 a.m. and 4 p.m.;
• Wear wide-brimmed hats, long sleeves, and sunglasses.

Active ingredients that work on existing spots

When the spot is already there, protection alone is not enough. The goal of cosmetics is not to bleach aggressively, but to regulate melanin synthesis, speed up turnover to eliminate pigmented cells, and protect against oxidative damage.

Vitamin C and ferulic acid

Vitamin C acts by inhibiting tyrosinase and reducing the conversion of dopaquinone into melanin, with a brightening effect on the complexion.

Ferulic acid works synergistically: it stabilizes its molecule and enhances its photoprotective action.

Gentle exfoliation

Melanin-laden cells are found in the superficial layers. Stimulating turnover helps remove them gradually.

• Mandelic acid: an alpha hydroxy acid derived from bitter almonds, with a large molecule that penetrates slowly without the irritation typically associated with glycolic acid. It also acts on tyrosinase. We discuss it in the guide to mandelic acid treatments.
• Plant enzymes such as bromelain and papain, which break down the bonds between dead surface cells while respecting the skin barrier.

Niacinamide

Niacinamide acts at a different stage: it blocks the transfer of melanosomes from melanocytes to keratinocytes. The pigment is produced but does not reach the visible layers.

That is why vitamin C and niacinamide work well together: they act on two distinct stages of the same process.

When to see a dermatologist

When spots are deep, long-standing, or extensive, at-home topical treatments may not be enough. Specialist evaluation is also essential to rule out precancerous lesions such as actinic keratoses or melanoma.

Available aesthetic medical treatments include:

• Lasers and intense pulsed light, which selectively target the pigment by fragmenting it;
• Medical peels with high concentrations of trichloroacetic or glycolic acid;
• Cryotherapy, using liquid nitrogen.

Pay attention to an important distinction: lasers and intense pulsed light are indicated for solar lentigines, but are contraindicated for melasma, where heat stimulates already overactive melanocytes and can worsen the condition. This is one reason why an accurate diagnosis must always precede treatment: two spots that look similar may require opposite approaches.

In conclusion

Managing sun spots requires consistent prevention and well-supported active ingredients. Making sun protection a daily habit all year round and supporting the skin with antioxidants and gentle exfoliants is the most effective way to achieve an even complexion.

If you want an already structured routine - peel, antioxidant serum, and protection - there is a dedicated protocol.