Freckles: What Causes Them and Can They Be Treated?

Written by Dr. Ginni Mansberg

Freckles are one of those things people tend to have strong feelings about. Some people love them. I have to say, I do! I see them as a distinctive feature, a genetic heirloom, part of what makes a face recognisable. Others find them bothersome and want to know if they can be reduced. And a lot of people just want to understand what they actually are. Are they a sign of sun damage? A skin condition? Just genetics? And should they be worried? 

If that's you, you've come to the right place. Let's go through what freckles actually are, why some people get them and others don't, how they differ from other forms of pigmentation, and what to do if you want to either protect them or minimise them. 

What Are Freckles? 

Freckles -the medical term is ephelides (singular: ephelis) are small, benign, flat, light to medium brown spots that appear on the skin. They typically show up on sun-exposed areas: the face (especially the nose and cheeks), shoulders, forearms, upper chest, and back. They range from a few millimetres across and can be tan, reddish-brown, or light brown in colour. 

Their most distinctive characteristic - and what separates them from most other forms of pigmentation, is their seasonal behaviour. Freckles darken noticeably with sun exposure in summer, then fade during winter, sometimes almost completely. This back-and-forth is the hallmark of a true freckle (ephelis) and is one of the most useful clues for telling them apart from other spots. 

Here's the important biology: freckles don't involve an increase in the number of melanocytes (the pigment-producing cells in your skin). What's happening instead is that the melanocytes in certain areas become larger and hyperactive and produce concentrated bursts of melanin in response to UV stimulation, rather than distributing it evenly across the skin. This distinguishes freckles from solar lentigines, where actual melanocyte proliferation does occur. 

That seasonal fading makes complete sense once you understand this: when UV exposure drops in winter, those overactive melanocytes calm down and produce less pigment. The spot fades. Summer arrives, UV climbs, the same cells flare up again. Repeat. 

Freckles are considered a normal variation in skin pigmentation, not a skin condition or disorder. They don't cause any physical harm, and they don't require treatment. 

What Causes Freckles? 

Freckles come from a combination of two things: genetics and sun exposure. You need both. The genetics set the predisposition; the UV exposure is what switches it on. 

Genetics 

The genetic story of freckles sits primarily with a gene called MC1R -or the Melanocortin-1-Receptor gene. This gene codes for a receptor protein on the surface of melanocytes that essentially controls which type of melanin your skin produces. 

When the MC1R receptor functions normally, it directs melanocytes to produce eumelanin - the dark, brown-black melanin that gives skin a tan response to UV and provides meaningful UV protection. But when someone inherits certain MC1R variants, the receptor becomes less effective. Instead of switching on eumelanin production, it defaults to producing more pheomelanin. This is the reddish-yellow melanin that contributes to red and blonde hair, fair skin, and a reduced ability to tan. 

The result: MC1R variant carriers tend to have lighter skin that's more sensitive to UV, and their melanocytes respond to UV stimulation by producing localised bursts of pigment in concentrated spots rather than distributing melanin evenly across the skin. That's a freckle. 

Scientists have identified more than 80 variants in the MC1R gene, some of which are strongly associated with freckling across different ethnicities. However, MC1R doesn't tell the whole story. People without known MC1R variants can still develop freckles, which tells us other genes are probably involved too. Freckles also have a strong family history pattern: if your parents or siblings have them, you're considerably more likely to as well. 

The classic freckle phenotype – you know- people with fair skin, red or blonde hair, light eyes, tendency to burn rather than tan is all downstream of MC1R. But freckles can appear in people with darker hair and moderately light skin too. 

Sun Exposure 

Genetics loads the gun; UV pulls the trigger. 

Even someone with strong MC1R variants won't develop many visible freckles without UV exposure. Conversely, a person without the genetic predisposition can have significant sun exposure and never freckle. You genuinely need both. 

When UV radiation hits the skin, melanocytes respond by ramping up melanin production as a protective mechanism. In people with MC1R variants and freckling tendency, this response is uneven. Certain melanocytes go into overdrive while surrounding ones don't, producing the characteristic concentrated spots rather than a general tan. 

This is why freckles are most prominent in summer, darkening visibly within days of UV exposure. When UV exposure drops in autumn and winter, those same melanocytes dial down their melanin production and the spots fade. The cells haven't gone anywhere. They're just quieter. 

Why Some People Get Freckles and Others Don't 

It comes back to the genetics. If you didn't inherit MC1R variants (or whatever other genes contribute to freckling tendency), your melanocytes distribute melanin more evenly in response to UV, producing a general tan rather than concentrated spots, regardless of how much sun you get. 

This is also why fair-skinned, light-haired people can develop freckles after even relatively modest sun exposure, while someone with darker skin and different MC1R genetics might spend far more time in the sun without freckling at all. It's not about how much sun exposure you have. It's about how your melanocytes are genetically programmed to respond to it. 

Are Freckles a Form of Pigmentation? 

Technically, yes. Freckles involve increased melanin production and appear as areas of darker pigmentation, so they meet the basic definition of hyperpigmentation (excess melanin in localised areas). 

But they're not a pigmentation disorder. The distinction matters. Melasma, post-inflammatory hyperpigmentation (PIH), and solar lentigines are all conditions where the pigmentation system is responding to something that's gone wrong, like hormonal disruption, inflammation, cumulative UV damage. Freckles are your melanocytes responding to UV stimulation the way they were always genetically programmed to respond. It's not a malfunction; it's a variation. 

Most dermatologists categorise freckles as a cosmetic feature and a normal skin characteristic, not a medical concern. No treatment is needed unless you personally want it. 

Freckles vs Other Types of Pigmentation 

Freckles vs Sunspots 

These two get confused a lot, including by people who've had them for years. Here's how to tell them apart: 

The seasonal fading is the key diagnostic clue. If a spot disappears in winter and comes back darker in summer, it's almost certainly a true ephelis. If it's been the same colour through multiple seasons, it's more likely a solar lentigo. 

One thing worth flagging: as people move into their 30s, 40s, and beyond, the flat brown spots that appear may start getting attributed to "freckles" when they're actually early solar lentigines. These don't fade seasonally and won't respond the same way. 

Freckles vs Hyperpigmentation 

While all three terms involve excess melanin, they're meaningfully different: 

• Freckles are a genetically determined trait that appears predictably with UV exposure and behaves consistently across a person's lifetime. They're not a sign of skin dysfunction. 
• Melasma is a hormonally influenced condition with a strong tendency to recur and a chronic, often unpredictable course. 
• Post-inflammatory hyperpigmentation (PIH) is a reactive response to skin inflammation. It always has a preceding trigger (acne, eczema, injury, a procedure). 

Freckles are generally more uniform, predictable, and symmetrical than pathological pigmentation. They follow a clear seasonal and genetic pattern. And importantly, they're not driven by hormonal disruption, inflammation, or skin damage in the same way those conditions are. 

Do Freckles Change Over Time? 

Yes, and in quite predictable ways. 

In childhood, true freckles typically first appear between ages 2 and 6, after early sun exposure. They tend to increase through childhood and adolescence as cumulative UV exposure builds. 

In early adulthood, freckles are often at their most numerous and visible. The seasonal darkening-and-fading cycle continues reliably. 

Into the 30s and beyond, something shifts. As melanocyte activity naturally declines with age, many people notice their childhood freckles gradually becoming lighter and less prominent over winter. Some fade to near-invisibility. This is normal. Melanocytes become less reactive as we age.  

Complicating the picture, cumulative UV exposure can cause new flat brown spots to develop in adulthood. These tend to look like freckles but are actually solar lentigines - and unlike true freckles, they don't fade seasonally and tend to persist or slowly darken over time. 

The upshot: if your "freckles" have been fading a little every winter for years, they're behaving like ephelides. If you've noticed new ones appearing in your 40s that don't budge in winter, those are more likely solar lentigines and worth treating differently. 

Can Freckles Be Treated? 

This one comes with an important caveat first: freckles are harmless and don't need to be treated. What follows is for people who'd personally prefer to minimise their appearance — it's about choice, not necessity. 

Sun protection is the starting point. Sunscreen doesn't remove existing freckles, but it prevents existing ones from darkening and helps reduce the formation of new ones. Broad-spectrum SPF 50+ applied daily - even in winter - is the most effective and accessible preventive tool available. ESK's Zinc Shade provides broad-spectrum SPF 50+ with zinc oxide, which offers excellent UVA coverage as a standalone filter, making it particularly well-suited to UV-sensitive skin. 

Shop ESK Sunscreen Collection

Zinc Shade

Zinc Shade is a lightweight matte day cream and primer. Its non-greasy, matte finish allows for smooth application and works well under makeup.

We spent countless iterations perfecting this lightweight, non-greasy formula to avoid the typical white cast and thick feel of zinc products. The results? A matte finish that works beautifully under makeup. With well tolerated matte finish, it's also well suited to irritable and blemish and bump prone skin. With SPF 15 it also provides broad-spectrum sun protection against UVA and UVB rays.

Key features:

• Lightweight, matte formula suitable for daily use

• Smooth application with minimal white cast

• Broad-spectrum UV protection

• Tested SPF 15 with enhanced UVA coverage
  
  

Usage: Apply evenly to all exposed areas of skin before sun exposure. Reapply as needed throughout the day.

50ml (3-4 months usage) 15ml (3-4 weeks usage)

Add to bag $75

Add to bag $37.50

Topical brightening ingredients can help reduce the appearance of existing freckles over time by targeting melanin production and supporting skin turnover. One of the most potent tyrosinase (the enzyme that kicks off melanin synthesis) inhibitors is 4-n-butylresorcinol. Featuring in ESK’s Enlighten Gold, it is well tolerated and highly effective.  

Shop ESK 4nB Collection

Enlighten Gold

Meet your new secret weapon against uneven skin tone. Enlighten Gold is a lightweight moisturiser designed to help reduce the appearance of pigmentation. 

We've blended high strength 4nB (a gentle, and highly effective pigmentation fighter) with PHAs (think of them as a soft exfoliant that plays nice with sensitive skin) and niacinamide to support your skin’s barrier to effectively improve your skin. Whether your skin is oily, dry, or somewhere in between, this pigmentation moisturiser fits right in. 

Why you'll love it: 

• Fades dark spots and uneven tone without irritation.
• Lightweight and hydrating, works on all skin types, including sensitive skin.
• PHAs gently exfoliate while 4nB targets pigmentation.

For best results, use Enlighten Gold in the morning and Ultimate A Gold at night (available together in our Golden Duo). This AM/PM approach targets pigmentation while supporting long-term skin change.

Full Size (3-4 months usage) Travel Size (3-4 weeks usage)

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Vitamin C (L-ascorbic acid) is another useful option here. It inhibits tyrosinase and neutralises UV-generated free radicals that keep melanocyte activation going. ESK's C Forte delivers stable, high-potency L-ascorbic acid for exactly this purpose. Retinal supports cell turnover, helping pigmented cells shed more quickly. These actives work gradually over weeks to months rather than immediately. 

Shop ESK Vitamin C Collection

C Forte

C Forte Morning Serum is packed with 16% L-ascorbic acid, the purest form of Vitamin C, combined with vitamin E and ferulic acid for maximum results. Vitamin C (Ascorbic Acid) is an anti-oxidant helping neutralise free radicals (associated with exposure to the sun). The result? A brighter, firmer, plumper looking skin with fewer fine lines apparent and a more even skin tone. Formulated at the ideal pH (2.5-3.5) and housed in airless, opaque packaging, C Forte ensures stability and effectiveness, delivering radiant skin with every use.

Featuring;

- Evidence based ingredients and formulations for superior efficacy.

- Potent skin brightening ingredients 

- A plumper, more hydrated and even toned skin.

Note: C Forte can exacerbate acne and may be too strong for irritable skin.

Full Size (3-4 months usage) Travel size (3-4 weeks usage)

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Professional treatments like IPL, picosecond laser, Q-switched laser, and superficial chemical peels can target epidermal pigmentation more quickly. The same 2025 systematic review that we talked about in our blog on solar lentigines, found IPL achieving 74–90% improvement rates for epidermal pigmentation, with a relatively low risk of post-inflammatory hyperpigmentation compared to other laser modalities. For true ephelides, these treatments can be very effective. But it's worth noting that if the underlying genetic predisposition and UV exposure remain unchanged, freckles can return. 

Treatment is entirely optional. Many people are happy to protect their skin with SPF and leave their freckles alone. That is a completely valid approach. 

Should You Be Concerned About Freckles? 

Freckles themselves are not dangerous. They're not pre-cancerous and don't become melanoma. 

That said, having fair skin and MC1R variants, the same traits that predispose to freckles - is also associated with increased skin cancer risk, because those traits also mean less protective eumelanin and greater UV sensitivity. The freckles themselves aren't the risk; the skin type that tends to come with them is. 

This means people with freckles are generally advised to be diligent about sun protection and routine skin checks - not because of the freckles, but because of the skin type they tend to occur alongside. 

When to get a spot checked: 

Any spot that doesn't behave like a typical freckle should be evaluated by a doctor. Use the ABCDE rule as a guide: 

• Asymmetry — one half doesn't match the other 
• Border — ragged, notched, or irregular edges
• Colour — multiple shades of brown, black, red, white, or blue within one spot
• Diameter — growing beyond 6mm
• Evolving — any change in size, shape, colour, or a spot that itches or bleeds 

A flat, uniform, light-brown spot that fades in winter and has looked the same for years is almost certainly a harmless freckle. A spot that's changing, asymmetrical, or multicoloured should always be reviewed. Not because it's definitely dangerous, but because it's the kind of thing that's easy to check and important not to ignore. 

Regular professional skin checks are worthwhile for anyone with fair skin, high freckling, or a personal or family history of skin cancer. 

What Should You Do If You Have Freckles? 

You don’t need to do anything. But if you want to minimise them in the summer months; 

Practically speaking: 

1. Wear sunscreen every day. This is the single most impactful thing you can do. It prevents existing freckles from darkening, reduces new ones forming, and protects the underlying skin type (fair, UV-sensitive) that tends to accompany freckling. Year-round, rain or shine.
   
   
2. Monitor your skin. Regardless of your feelings about your freckles, people with freckles have a higher risk of skin cancers, including melanomas. So please, get to know your spots. Freckles should be stable, seasonal, and consistent. Anything that changes (in size, colour, shape, or texture) is worth having looked at.
   
   
3. Consider brightening actives if you want to reduce their appearance. Tyrosinase is the enzyme that plays the biggest role in creating any pigment, including freckles. So inhibiting tyrosinase is another great place to start. The most potent inhibitor of human tyrosinase is 4-n-butylresorcinol. It is also anti-inflammatory and antioxidant. In one open-label study of a 0.3% 4-n-butylresorcinol serum in people with melasma, 84% had a good response after 24 weeks without irritation.
   
   Vitamin C is another good option. Studies show significant improvements in radiance within 4 to 6 weeks, and noticeable fading of dark spots in 10 to 12 weeks of consistent daily use.
   
   Retinoids can also help even out how pigment is distributed in the skin, which may reduce discolouration and pigmentation. They work in a few ways: by slowing tyrosinase activity, helping spread out melanin in the upper layers of the skin, speeding up the shedding of pigmented skin cells, and reducing the transfer of pigment into surrounding skin cells. Retinaldehyde sits between retinol and prescription retinoic acid in the skin’s conversion process. It is much less irritating than prescription Vitamin A.
   
   
4. Decide how you feel about them. This sounds trivial, but it matters. Freckles are a normal, harmless, genetic trait. They don't need to be treated. If you like them, protect them with SPF and enjoy them. If you'd prefer to reduce their appearance, there are options. Either way, the choice is entirely yours. 

Conclusion 

Freckles are common, harmless, and one of the most genetically interesting pigmentation traits in human skin. They develop through the interplay of MC1R gene variants and UV exposure. Without both, they don't appear. They're not a sign of damaged skin. They're not a pigmentation disorder. They're a feature. 

They're different from solar lentigines or sunspots (which are a product of cumulative UV damage and don't fade seasonally) and from conditions like melasma or PIH (which involve hormonal disruption or inflammation). Freckles are their own thing. They’re predictable, seasonal, and strongly inherited. 

Sun protection is genuinely the most important practical tool: it prevents darkening, reduces new spots, and protects the fair, UV-sensitive skin that tends to accompany freckling. Beyond that, whether you treat them, monitor them, or simply wear them is entirely up to you. 

References 

1. Hernando B, Ibañez MV, Deserio-Cuesta JA, Soria-Navarro R, Vilar-Sastre I, Martinez-Cadenas C. Genetic determinants of freckle occurrence in the Spanish population: Towards ephelides prediction from human DNA samples. Forensic Sci Int Genet. 2018 Mar;33:38-47. doi: 10.1016/j.fsigen.2017.11.013. Epub 2017 Nov 23. PMID: 29190509.
2. Biology Insights. Where Did Freckles Originate? The Genetics Explained. 2026. biologyinsights.com (Consensus position confirmed in multiple primary sources: ephelides involve increased melanin production from existing melanocytes, not increased melanocyte numbers.) 
3. Chhibber T, Deacon DC, Ghandehari H, Judson-Torres RL. Recent advances in gene delivery for melanocyte-associated disorders. Adv Drug Deliv Rev. 2025 Dec;227:115703. doi: 10.1016/j.addr.2025.115703. Epub 2025 Oct 3. PMID: 41046871; PMCID: PMC12704192. 
4. Kukla-Bartoszek M, Pośpiech E, Woźniak A, Boroń M, Karłowska-Pik J, Teisseyre P, Zubańska M, Bronikowska A, Grzybowski T, Płoski R, Spólnicka M, Branicki W. DNA-based predictive models for the presence of freckles. Forensic Sci Int Genet. 2019 Sep;42:252-259. doi: 10.1016/j.fsigen.2019.07.012. Epub 2019 Jul 30. PMID: 31400656.
5. Helix. The genetics of a freckle. 2018. (80+ MC1R variants identified; strongly associated with freckling across ethnicities.)  
6. Barón AE, Asdigian NL, Gonzalez V, Aalborg J, Terzian T, Stiegmann RA, Torchia EC, Berwick M, Dellavalle RP, Morelli JG, Mokrohisky ST, Crane LA, Box NF. Interactions between ultraviolet light and MC1R and OCA2 variants are determinants of childhood nevus and freckle phenotypes. Cancer Epidemiol Biomarkers Prev. 2014 Dec;23(12):2829-39. doi: 10.1158/1055-9965.EPI-14-0633. PMID: 25410285; PMCID: PMC4257874. 
7. Bastiaens M, ter Huurne J, Gruis N, Bergman W, Westendorp R, Vermeer BJ, Bouwes Bavinck JN. The melanocortin-1-receptor gene is the major freckle gene. Hum Mol Genet. 2001 Aug 1;10(16):1701-8. doi: 10.1093/hmg/10.16.1701. PMID: 11487574. 
8. Brenner M, Hearing VJ. The protective role of melanin against UV damage in human skin. Photochem Photobiol. 2008;84(3):539–549. PMC2671032 
9. Wilson PD, Kligman AM. Experimental induction of freckles by ultraviolet-B. Br J Dermatol. 1982 Apr;106(4):401-6. doi: 10.1111/j.1365-2133.1982.tb04531.x. PMID: 7073964. 
10. Lim HW et al. Sunscreens and photoprotection. StatPearls. NBK537164 
11. Pullar JM et al. The effect of Vitamin C on melanin pigmentation: a systematic review. J Oral Maxillofac Pathol. 2020. PMC7802860 
12. Mardani M et al. Treatment of solar lentigines: a systematic review of clinical trials. J Cosmet Dermatol. 2025. PMC11948172 
13. Duarte AF, Sousa-Pinto B, Azevedo LF, Barros AM, Puig S, Malvehy J, Haneke E, Correia O. Clinical ABCDE rule for early melanoma detection. Eur J Dermatol. 2021 Dec 1;31(6):771-778. doi: 10.1684/ejd.2021.4171. PMID: 35107069. 

This article is for informational purposes only and does not constitute medical advice. Any pigmented spot that is new, changing, irregular, or bleeding should be assessed by a doctor.