October 07, 2026
Short answer: No. Sun spots (solar lentigines) are individual, sharply edged brown spots left by years of accumulated UV exposure, and they stay put once formed. Melasma is a patchy, symmetrical pigmentation of the cheeks, forehead, upper lip or chin that is driven by light, hormones and a genetic tendency together, and it lightens and darkens with the seasons. Both are worsened by the sun, but they sit in different tissue, respond to different treatments and relapse very differently.
Shape and distribution are the most useful clues. A sun spot is a single flat macule, usually round or oval, a few millimetres to a centimetre across, with a crisp border, and it appears wherever the skin has had the most sun over the years: the backs of the hands, forearms, shoulders, temples and cheekbones. Several can sit next to each other, but each one is a separate spot.
Melasma is a patch rather than a spot. It has irregular, map-like edges, it spreads across an area, and it is characteristically symmetrical: both cheeks, the centre of the forehead, the upper lip, the chin or the jaw. It affects mainly women in their reproductive years and people with Fitzpatrick skin types III to V, and more than 40% of patients report affected relatives (Handel 2014). Known triggers include sun exposure, pregnancy, sex hormones, inflammation of the skin, some cosmetics, steroids and photosensitizing drugs (Handel 2014). Sun spots, by contrast, track age and cumulative UV, and are common in fair skin.
The behaviour over a year is a third clue. Melasma typically fades in winter and comes back within weeks of stronger light. A sun spot changes little from season to season. Many people over 35 have both, and a red, irritated surface can make either look larger than it is, which is why a trained eye is worth more than a photo here.
Because the underlying tissue is different. In a biopsy study of 56 Korean women, melasma skin had more melanin in every epidermal layer, more and more active melanocytes, and more solar elastosis in the dermis below than the normal skin next to it (Kang 2002). Reviewing the decade of work that followed, which pointed to blood vessel growth and sun-damaged elastic tissue as part of the picture, Passeron and Picardo proposed that melasma is best understood as a photoaging disorder in genetically predisposed skin (Passeron 2018). The pigment is the visible part of an active process. Remove the pigment and the process remains, which is why melasma recurs.
A sun spot is a more settled lesion. It results from chronic UV exposure and is regarded as an early sign of photoaging (Mardani 2025), a local excess of pigment in the epidermis rather than a whole region of reactive skin. Once it is removed, it does not come back from the same signal unless the area keeps getting sun.
The treatments follow from that. A systematic review of 41 trials in 3,234 patients reported clearance rates of 74.6% to 90% for intense pulsed light and up to 93% for picosecond lasers, concluded that laser therapy was more effective than the other options, and found side effects mostly mild and transient (Mardani 2025). Melasma is the opposite case: a network meta-analysis of 39 trials called its outcomes unsatisfactory because of its complex causes and tendency to recur, ranked a laser combined with topical medication above the same laser alone, and stressed that skin type and side effects must guide the choice (Ma 2023). Heat and injury are themselves stimuli for pigment, so an energy treatment that suits a sun spot can darken melasma. Booking a device treatment for "pigmentation" without knowing which one you have is an easy and expensive mistake.
The home plan overlaps, but the emphasis differs:
Avoid scrubs, stacked acids, DIY lemon or peel treatments and harsh "spot correctors" that leave the skin burning; on melasma they tend to add the inflammation that deepens it. If the brown marks followed pimples instead, they are a third thing again, and why acne marks linger explains how they behave.
Have a physician or dermatologist look at any spot that is new after 40, growing, raised, unevenly coloured, with a blurred or notched edge, bleeding, itching, or simply different from your other spots. Lentigo maligna, an early form of melanoma, can look like an enlarging flat brown spot on the sun-exposed face, and no cosmetic product or treatment should go on a lesion that has not been checked. Also see a physician if patches appeared after a new medication, if pigmentation is one-sided, or if melasma began in pregnancy and you want to treat it: hydroquinone, prescription retinoids and oral tranexamic acid are medical decisions, and what skincare is safe during pregnancy covers the home side.
The clinical descriptions here are consistent across dermatology texts and reviews, but the biopsy work comes from one population of Korean women (Kang 2002), and the photoaging model of melasma is an interpretation of laboratory and clinical findings rather than a settled mechanism (Passeron 2018). The treatment reviews pool many small trials of uneven quality with short follow-up, and both call for larger randomized studies (Mardani 2025; Ma 2023). Evidence for an ingredient or a device class is also not evidence for a particular product or clinic protocol. Use this to understand your skin, not to label it: it is not a diagnosis and not a substitute for an examination by a physician or dermatologist.
Literature retrieved from PubMed.
Spots versus patches is hard to judge from a bathroom mirror, and the routine for each is different. Email Clara your current product list, how long you have used each product, and one photo of the area taken in daylight by a window without makeup. She will reply with what to pause first and whether what you describe sounds like something a physician should see before anything else. Write to info@completeelixir.com.
For a broader guide to which brightening actives reactive skin tolerates, visit the Skincare Ingredient Tolerance Resource Centre.
Written and reviewed by Clara Song, Ph.D.
Founder and in-house formulator, COMPLETE ELIXIR
Ph.D. in Data Science · Medical Aesthetician Diploma
Last reviewed: October 7, 2026
This article distinguishes ingredient evidence, formulation rationale, finished-product evidence and professional observation. It is educational and does not replace medical diagnosis or treatment.
October 07, 2026
October 07, 2026
October 07, 2026
