Melasma and Sunspots: Plan Beats Laser Settings

When melasma and sunspots show up on the same face, the safer approach is usually fewer, spaced sessions rather than one aggressive pass. Low-fluence Q-switched laser toning is generally effective and considered safe, but high cumulative energy has also been linked to patchy hypopigmentation and a high relapse rate for melasma specifically. Diagnosis of which pattern you have should come before any decision about laser power.

Hello, I'm Dr. Kim Yeonjin, Director of UH CELL Clinic's Gangnam branch. When I examine a face with both melasma and ordinary sunspots, I start by sorting the brown patches into two groups rather than reaching for a laser setting first.

Two Patterns, Two Reactions

The first group is sunspots, freckles, and age spots with reasonably defined edges. The second is melasma, which tends to have blurred borders and spreads across both cheeks. These two patterns can respond differently to the same laser, so figuring out which one I'm looking at comes before any treatment decision.

Why Melasma Reacts to Heat and Irritation

Melasma can darken again in response to heat and inflammation, which makes it a more sensitive pattern to treat than a typical sunspot. Yeon Seok Lee and colleagues at the Department of Dermatology, Nowon Eulji Medical Center, reviewed 42 studies in a 2022 systematic review published in Medicina and found that low-fluence Q-switched Nd:YAG laser treatment, commonly called laser toning, was generally rated effective and safe for melasma. The same review noted that aggressive use of this laser can still trigger unwanted inflammation and make pigment worse instead of better.

What Repeated Sessions Can Reveal

That 2022 review also reported that blotchy hypopigmentation, patches of skin that turn lighter than the surrounding area, can occur in a small number of cases and may persist for a long time. The review linked this risk to higher cumulative laser energy over multiple sessions. A 2019 review in the Indian Journal of Dermatology, Venereology and Leprology (IJDVL) described a modified protocol, spacing toning sessions two weeks apart for six to eight treatments instead of weekly, as an approach the reviewed studies associated with lower hypopigmentation risk.

Because of this, I judge "low irritation" by the full course of treatment, the number of sessions and the interval between them, more than by the energy of any single pass. A sharply defined sunspot and a broad patch of melasma call for different energy levels and different schedules. Planning each pattern separately is the safer approach.

Planning Around a Short Stay in Seoul

Melasma tends to recur, so I plan sessions as part of an ongoing course rather than a single finished treatment. Before we plan sessions, I ask patients to confirm a few things so the plan stays realistic:

• How many days you're in Seoul, and whether a follow-up visit is possible later
• Any recent sun exposure or tanning
• Your history with laser treatments, including whether pigment darkened or lightened afterward
• Whether you can keep up daily sun protection and any prescribed skincare after you return home

Our Gangnam location sits inside the UH FLAT SIGNATURE Gangnam building, so patients staying at that hotel can return directly to their room to rest after treatment. Guests staying at UHC hotels can choose one complimentary option, either a 30-minute oxygen chamber session or a vitamin IV drip; using both is available with the vitamin IV priced at 55,000 KRW.

When to Contact the Clinic

If pigment looks darker than before, if you notice pale patches forming, or if redness and stinging last more than a few days after treatment, come back in for an evaluation instead of managing it yourself with over-the-counter creams or exfoliation.

FAQ

Does darker skin need extra caution with this laser?

It can. The 2022 Nowon Eulji Medical Center review found that both blotchy hypopigmentation and rebound hyperpigmentation were reported more often in darker skin types, including Fitzpatrick IV and V. In those cases, a more conservative energy level and session count is the safer starting point.

Should topical treatment be combined with the laser?

Sometimes, depending on the skin. The 2019 IJDVL review described studies where a combination lightening cream, containing hydroquinone, tretinoin, and fluocinolone, used before laser toning was associated with better safety and results than starting the cream only after treatment. Whether to prescribe it depends on what the skin looks like at consultation.

If melasma comes back after toning, did the treatment fail?

That's closer to how melasma behaves than a sign of failure. A 2017 review in the International Journal of Women's Dermatology covering laser and light therapy found that three-month recurrence rates after low-fluence Q-switched laser monotherapy ranged from 64 to 81 percent, which is high. That's why daily sun protection and combination treatment approaches matter as much as the laser itself.

Individual skin response and recovery time vary. Please discuss your specific diagnosis and treatment plan with a physician.