They are all brown. They all appear on your face. They are all made of melanin. And they are treated almost completely differently. Sunspots, freckles, and melasma are three of the most commonly confused forms of hyperpigmentation, and that confusion is one of the main reasons people cycle through brightening products for years without finding the right answer. The diagnosis matters, because the cause matters, because the cause determines everything about what will actually work.
This is a clinical breakdown of all three: what they are, how to tell them apart, and what that distinction means for how you treat them, particularly if you have South Asian skin where the consequences of getting this wrong are significantly higher.
Why the Distinction Matters
Most brightening products treat the melanin, not the mechanism. If you use a tyrosinase inhibitor on hormonal melasma, you will get limited results because the problem is not primarily at the enzyme stage — it is at the signalling stage. If you use a signal blocker on UV-induced sunspots, you are interrupting the wrong pathway for that trigger. If you use a transfer inhibitor on freckles, you may maintain the skin's tone but you will not change the underlying genetic activity driving the pigmentation.
Identifying which type of pigmentation you have is not a cosmetic formality. It is the clinical prerequisite for choosing an approach that actually works. The three conditions also have different prognoses, different relationships with SPF, and very different implications for South Asian skin specifically.
Freckles: Genetic Pigment Activation
What They Are
Freckles, clinically called ephelides, are small, flat, uniform spots of concentrated melanin. They are not a sign of skin damage. They are a genetic trait, strongly linked to variants in the MC1R gene that governs melanocyte behaviour. People with freckles have melanocytes that are more reactive to UV light than average — not more numerous, not larger, just more easily triggered. That reactivity is inherited.
What They Look Like
- Small, typically 1–3mm, and sharply defined
- Light tan to medium brown, usually consistent in colour across spots
- Concentrated on UV-exposed areas: nose, cheeks, shoulders, forearms
- Fade significantly in winter and deepen with sun exposure — this seasonal variation is one of the clearest diagnostic markers
- Present from childhood, usually appearing or intensifying around ages 5 to 10
- More common in fair skin but do occur in South Asian skin, particularly in Fitzpatrick III individuals
What Drives Them
The underlying cause is genetic. UV light activates the melanocytes that carry the MC1R variant, causing localised melanin bursts in a scattered pattern. Without UV exposure, the melanocytes quiet down — which is why freckles genuinely fade in winter months. The cells are not producing excess pigment constantly; they are overreacting to a specific trigger.
Key Clinical Fact
Freckles are among the easiest pigmentation types to manage with consistent SPF because removing the UV trigger genuinely reduces melanocyte activation. They are also among the most likely to return if SPF is discontinued, for the same reason.
Sunspots: Cumulative UV Damage
What They Are
Sunspots, clinically called solar lentigines (singular: lentigo), are a form of UV-induced hyperpigmentation that reflects actual structural change in the skin, not just temporary melanocyte activation. They are sometimes called age spots or liver spots, though neither term is accurate — they are caused by cumulative UV exposure, not age itself, and have nothing to do with the liver.
What They Look Like
- Larger than freckles, typically 5–20mm, with irregular or well-defined borders
- Medium to dark brown, sometimes with slight variation within a single spot
- Appear on chronically sun-exposed areas: face, hands, décolletage, forearms
- Do not fade seasonally — this is the critical distinction from freckles. A sunspot present in summer is present in winter
- Develop gradually across decades, typically first appearing in the mid-30s in individuals with significant UV history
- In South Asian skin, can appear earlier due to cumulative outdoor UV exposure and higher baseline melanocyte activity
What Drives Them
Repeated UV exposure causes localised proliferation of melanocytes. Unlike freckles, where the cells are merely reactive, in solar lentigines the number of melanocytes in the affected area actually increases. There is also elongation of the epidermal rete ridges and an increase in basal layer melanin. This is structural change, which is why sunspots persist year-round and why they are harder to treat than freckles.
Key Clinical Fact
Because sunspots involve an increased population of melanocytes rather than just increased activity, SPF alone will not resolve them. It will prevent them from darkening and stop new ones forming, but it will not reduce existing spots. Tyrosinase inhibition and exfoliation are both necessary components of effective treatment.
Melasma: Hormonal Pigmentation
What It Is
Melasma is a chronic, hormonally driven form of hyperpigmentation. It is one of the most treatment-resistant pigmentation conditions and, crucially, one of the most frequently misdiagnosed. It is often mistaken for sunspots or general uneven tone, leading to treatment protocols that produce temporary improvement followed by rebound — sometimes darker than the original pigmentation.
What It Looks Like
- Larger patches rather than discrete spots, often bilateral and symmetrical across the face
- Most common distribution: centrofacial (forehead, nose, upper lip, chin), malar (cheeks and nose), and mandibular (jaw)
- Greyish-brown to dark brown, often with blurred or feathered edges
- Worsens with UV exposure and hormonal fluctuation — many people notice it flaring before menstruation, during pregnancy, or when starting or stopping oral contraceptives
- Predominantly affects women; only approximately 10% of melasma cases occur in men
- Disproportionately common in Fitzpatrick IV to VI skin types, including South Asian, Middle Eastern, and Latin American populations
What Drives It
Melasma is driven by a combination of hormonal influence, UV exposure, and visible light sensitivity, with a genetic predisposition underlying all of it. Oestrogen and progesterone stimulate melanocyte-stimulating hormone receptors, causing melanocytes to overproduce melanin in affected areas. UV light amplifies this effect dramatically, which is why melasma almost always worsens in summer and can be triggered or worsened by heat, infrared light, and even blue light from screens.
There is also a significant vascular component to melasma — increased vascularity in affected skin creates an inflammatory environment that further drives pigmentation. This vascular element is why treatments targeting melanin alone often underperform in melasma: they are addressing one part of a multi-driver condition.
Key Clinical Fact
Melasma is chronic and tends to recur. Even when successfully faded, it will return with hormonal change or unprotected UV exposure. Treatment for melasma is therefore a long-term management strategy, not a finite course. Mineral SPF that blocks visible light and UV (not just UV alone) is significantly more effective for melasma than chemical SPF.
Side-by-Side Comparison
| Freckles | Sunspots | Melasma | |
|---|---|---|---|
| Clinical Name | Ephelides | Solar Lentigines | Melasma / Chloasma |
| Primary Cause | Genetics (MC1R variant) | Cumulative UV damage | Hormonal + UV + genetics |
| Appearance | Small, uniform, scattered spots | Larger, irregular, defined spots | Diffuse patches, bilateral |
| Fades in Winter? | Yes — significantly | No | Partially |
| Age of Onset | Childhood | Mid-30s onwards | Any age (hormonal trigger) |
| Most Affected Areas | Nose, cheeks, shoulders | Face, hands, décolletage | Forehead, cheeks, upper lip, jaw |
| Vascular Component | No | No | Yes — significant |
| Risk of Rebound | Low (with SPF) | Moderate | High — chronic condition |
| Responds to SPF Alone | Yes, partially | Prevents worsening only | Essential but insufficient |
| South Asian Prevalence | Moderate (Fitz III) | High | Very high |
How South Asian Skin Changes the Picture
All three of these conditions occur in every skin type. But South Asian skin, typically Fitzpatrick III to V, has specific characteristics that affect how each condition presents and how it should be approached.
The first is higher baseline melanocyte density and activity. This means that all three conditions tend to present darker and more diffusely in South Asian skin than in lighter skin types. A sunspot that appears as a pale tan patch in Fitzpatrick II skin may appear as a dense dark brown mark in Fitzpatrick V skin.
The second is a lower irritation threshold for aggressive brightening treatments. Hydroquinone, high-percentage glycolic acid, and retinoids used at prescription strength can all trigger rebound hyperpigmentation — post-inflammatory darkening caused by the treatment itself — in melanin-rich skin. This is not a reason to avoid brightening treatment; it is a reason to choose barrier-safe ingredients and gradual protocols over aggressive ones.
The third is the prevalence of melasma. South Asian women have significantly higher rates of melasma than the global average, driven by a combination of genetic predisposition, hormonal sensitivity, and high UV exposure in countries of origin. Many women who believe they have stubborn sunspots or uneven tone are actually managing undiagnosed melasma — a distinction that changes every element of an effective treatment approach.
The fourth factor is visible light sensitivity. Melasma in South Asian skin is often visible light-sensitive as well as UV-sensitive, meaning standard chemical SPF that filters UV alone is insufficient. Mineral SPF with iron oxides, which filter both UV and visible light, is considerably more effective for melasma management in this population.
How to Tell Which One You Have
A dermatologist can confirm diagnosis using a Wood's lamp (UV light examination) and dermoscopy, and this is the recommended route for anyone with melasma or complex pigmentation. But there are practical self-assessment markers that can help you narrow it down before you seek a clinical opinion.
- Spots appeared in childhood or early adolescence
- They visibly lighten or almost disappear in winter months
- They are small, consistently round or oval, and evenly pigmented
- Other family members have the same pattern
- They darken noticeably after even short sun exposure
- Spots appeared in your 30s or later, gradually
- They are stable year-round and do not fade in winter
- They are larger than 5mm and slightly irregular in border
- They appear on the most UV-exposed areas — tops of hands, face, shoulders
- You have a history of significant sun exposure or outdoor work
- Pigmentation appears as patches rather than individual spots
- It is bilateral — present on both sides of the face in a mirrored pattern
- It worsens with heat, sunlight, or hormonal change
- It appeared or worsened during pregnancy or with oral contraceptive use
- Over-the-counter brightening products help temporarily but pigmentation returns
- You have South Asian, Latin American, or Middle Eastern heritage
What Each One Responds To
Freckles
Freckles are among the most SPF-responsive pigmentation types. A broad-spectrum mineral SPF used consistently will noticeably reduce freckling over one to two seasons. Niacinamide supports this by reducing melanin transfer, keeping tone more even even when melanocytes do activate. Tranexamic acid can help interrupt the signalling response to UV. No exfoliation is required for freckles in the same way as for sunspots, since the pigmentation is superficial and driven by activity rather than structural change.
Sunspots
Because sunspots involve structural changes in melanocyte density and basal layer melanin, they require a multi-stage approach. Exfoliation — whether chemical (AHAs such as glycolic or lactic acid) or physical — accelerates the shedding of pigmented cells at the surface. Tyrosinase inhibition with azelaic acid reduces ongoing melanin production. SPF prevents new spots and darkening of existing ones. Timeline for visible improvement is typically 12 to 20 weeks of consistent use.
Melasma
Melasma requires the most targeted and comprehensive approach. The signalling dysfunction at its core makes tranexamic acid the most effective first-line topical intervention. Azelaic acid addresses concurrent tyrosinase activity and reduces the inflammatory component. Niacinamide manages transfer and reinforces the barrier against further inflammatory triggers. Mineral SPF with iron oxides is significantly more effective than chemical-only SPF for melasma because it blocks visible light, which is an independent trigger for hormonal pigmentation. Niacinamide also directly reduces erythema, addressing the vascular component that purely pigment-targeting treatments miss.
Melasma is a chronic condition. Even when faded successfully, it requires ongoing maintenance with SPF and active ingredients to prevent recurrence. Hormonal management — discussing contraceptive options with a GP if the melasma is strongly hormonally triggered — can significantly improve treatment outcomes.
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