In short. The point at which further sessions add risk rather than change, how that point is recognised, and what to do instead of continuing.
Key points
- A course of melasma treatment should state at the outset what would cause it to stop.
- Those conditions usually include a lack of further change, an adverse response, and the skin becoming reactive between sessions.
- A patient who knows them in advance can raise them at an appointment, which is more useful than discovering afterwards that the course had no such point.
Every treatment course should have an end, and for melasma the end is more important than for most. Continuing past the point of change adds risk without adding benefit, and it is a common way for a course that was going well to end badly.
Recognising the point
The clearest signal is that the area has stopped lightening while the skin is still tolerating treatment. If successive sessions produce no visible change, the remaining pigment is not pigment that this treatment reaches, and further sessions are not going to reach it either. The second signal is the recovery interval. When the time between sessions is being spent settling irritation rather than consolidating a change, the skin is carrying more inflammation than it can resolve, and that is the state in which rebound darkening occurs.
A third signal is any change in the wrong direction. Darkening after a session has settled, persistent redness, stinging, or skin that feels reactive between appointments are all reasons to stop and review rather than to continue on schedule.
Stopping is a planned outcome, not a failure
A course of melasma treatment should state at the outset what would cause it to stop. Those conditions usually include a lack of further change, an adverse response, and the skin becoming reactive between sessions. A patient who knows them in advance can raise them at an appointment, which is more useful than discovering afterwards that the course had no such point.
What to do instead of continuing
When the course stops, the plan does not. Daily broad-spectrum protection continues indefinitely, topical pigment treatment continues, and the skin is treated gently while it settles. If the pigment deepens again later, further procedural treatment can be considered once the skin is stable and the pigment is no longer active, which is a different decision from continuing a course that had stopped working. Reviewing the skin periodically, rather than on a schedule of appointments, is what makes that judgement possible.
Reasons to stop and review
- The area is no longer lightening, but sessions are still being added.
- The skin is red, stinging or reactive for longer between sessions than it was at the start.
- The pigment has deepened after a session has settled, rather than lightened.
There is a commercial asymmetry here that is worth naming. A course with no endpoint is more profitable than one that stops when it stops working, and melasma is a condition in which a patient can be kept attending for a long time without any further change. That is why the stopping rule matters more on this subject than on most, and why it should be established before the first session rather than discussed at the point of disagreement.
Ask at the assessment what would make the course stop, and who decides. A clinic that can answer that specifically has thought about the risk. One whose plan has no endpoint is describing a course that continues until the patient stops paying.
Frequently asked questions
How do I know when a course has gone far enough?
When the area has stopped lightening between sessions while the skin is still tolerating treatment, and when the interval between sessions is being spent recovering rather than settling. A course that is producing no further change but is still being extended is adding risk without adding benefit. That judgement is made against the skin's response rather than against a planned number of sessions.
Is it a failure to stop before the planned course finishes?
No, and stopping is a normal part of treating melasma rather than an admission that it did not work. The plan should say at the outset what would cause it to stop, which usually includes a lack of further change, an adverse response, or the skin becoming reactive between sessions. A course with an open-ended number of sessions has no such point.
What happens if I stop and the pigment deepens again?
Protection and topical treatment continue, and further procedural treatment may be considered later if the skin has settled and the pigment is stable. What is not useful is starting another course immediately while the skin is still reactive, because that repeats the provocation rather than addressing it.
Risks & Limitations
- Rebound darkening. Melasma-prone skin produces more pigment in response to inflammation, and both a laser and a peel create inflammation deliberately.
- Blistering, crusting or a burn if the settings or the contact time do not match the skin, with a small risk of scarring.
- Post-inflammatory pigment change in either direction, darker in most cases and lighter in some.
- Infection in skin that has been broken, and uneven peeling after a chemical agent.
- An allergic reaction to the peeling agent, which is a reason a test spot comes first.
- Increased sun sensitivity after either route, while the skin is settling and afterwards.
- Melasma is a tendency, not a lesion. Neither route removes it, both are followed by maintenance, and the pigment usually returns.
- No outcome is guaranteed, and individual response varies with the depth of the pigment, the skin type and how consistently the skin is protected.
When to Seek Care
- Blistering, crusting or a burn in the treated area — contact the treating team the same day.
- The treated area becoming darker rather than lighter after a session has settled.
- Spreading redness, swelling, pain or discharge, or a fever.
- Skin that stays red, stings or feels reactive between sessions rather than returning to normal.
- A dark patch that is new, changing in size, shape or colour, bleeding or failing to heal — seek assessment rather than treatment.
- Difficulty breathing, or swelling of the lips, tongue or throat after a chemical peel — seek emergency care immediately.
References & Further Reading
- American Academy of Dermatology Association (AAD) — patient information on melasma and pigmentary disorders
- British Association of Dermatologists (BAD) — guidance on laser and light therapy and on chemical peels
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance on skin lesions and referral
- Cochrane Library — systematic reviews in the treatment of melasma
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.