Reviewed November 3, 2026

Melasma and Sun Spots Look Similar and Behave Nothing Alike

A sun spot, a solar lentigo, is a discrete flat brown spot with a fairly sharp edge, sitting where sun has hit for decades. Melasma forms larger, blotchier patches with irregular borders, usually symmetrical across the cheeks, forehead, or upper lip, and it is driven by a mix of ultraviolet and visible light, heat, and hormonal signals. Lentigines respond well to procedures and brighteners. Melasma improves slowly, relapses easily, and can be made worse by the laser and aggressive peeling that fix lentigines, especially on deeper skin tones.

Both arrive as brown patches in the mirror, so both get the same vitamin C serum and the same frustrated review three months later. Then a clinic sells a laser package that lifts the lentigines beautifully and leaves the melasma darker than it started, because the two conditions share a color and almost nothing else.

The separating questions are pattern and history. Where exactly are the marks, are they mirrored on both sides of the face, did they arrive or worsen with pregnancy, hormonal contraception, or a sunny job, and do they fade in winter only to return by June? Those answers sort most cases before any device is switched on.

Pattern recognition you can do in the mirror

Lentigines are individuals. Each spot has its own size and edge, they scatter across the cheeks, temples, backs of hands, and shoulders, and they accumulate with age and exposure history. Melasma is a geography: broad, merged patches with feathered borders that respect a symmetrical map, both cheeks, both sides of the forehead, the upper lip, the jawline.

Melasma also changes with state. It darkens within weeks of more light exposure, often deepens with heat alone, saunas and hot kitchens included, and lightens modestly in low light months. Lentigines stay put through seasons. A patch that breathes with the calendar is telling you its diagnosis.

Why treatment ladders run in opposite directions

For lentigines, targeted procedures are efficient because the pigment sits in a defined spot and the surrounding skin behaves normally. For melasma the pigment machinery across the whole patch is primed; inflammation and heat switch it back on. Aggressive resurfacing creates inflammation by design, and post inflammatory pigmentation joins the melasma, which is the classic way well meant treatment darkens it.

Melasma care is therefore slow and layered: rigorous daily photoprotection including a tinted sunscreen, because iron oxides block the visible light that ordinary UV filters miss, gentle brighteners such as azelaic acid, and prescription therapy, classically hydroquinone in supervised cycles or newer alternatives, for defined periods. Tranexamic acid, oral and topical, has entered specialist practice for stubborn cases. None of it is a two week project.

The sunscreen detail that decides melasma outcomes

Ultraviolet filters alone underprotect melasma. Visible light, especially blue light, drives pigment in susceptible skin, and standard SPF ratings do not measure visible light protection. Tinted sunscreens containing iron oxides are the practical answer, worn in a full two finger length amount for the face and reapplied during outdoor days.

Skipping this turns the rest of the routine into a treadmill: brighteners lighten at night, morning light re-darkens by the weekend. People conclude the products failed when the protection layer was the failure. If you change one thing before buying another serum, change the sunscreen to a tinted one you will wear generously.

Frequently asked questions

Can melasma go away permanently?

It can fade to near invisibility with sustained treatment and protection, but the tendency remains and relapses are common after sun exposure, hormonal changes, or stopping maintenance. Clinicians frame it as a managed condition. Anyone promising permanent removal in a set number of sessions is overselling.

Is hydroquinone safe to use for melasma?

Used in limited cycles at prescription strengths with supervision, it remains a reference treatment. Problems, including a paradoxical darkening called exogenous ochronosis, are linked to prolonged unsupervised use, very high strengths, and adulterated products. It is a drug with a protocol, not a cosmetic to use forever.

Why did laser make my pigmentation worse?

Heat and inflammation from laser treatment can trigger pigment production in melasma prone skin, and the darker result often appears weeks later, which hides the connection. This risk is exactly why specialists sort lentigines from melasma before choosing a device, and why a test area is prudent.

Does melasma only affect women?

No, men get melasma too, roughly a tenth of cases in many clinic series, and it is underdiagnosed in men because they present later. Hormones are one driver among several; genetics, light, and heat matter for everyone with the condition.