What this site is for
It exists for one purpose: to let someone whose skin changed colour after a laser session tell the expected course from the finding that needs to be seen. That is why the emergency routing sits above every explanation on this page, why the three pigment changes are separated before anything is said about treatment, and why the findings that need care are repeated in the asset rather than stated once.
What it deliberately does not do
It does not name brands of devices or products: devices are described by class and topical agents by their class or as the agent prescribed for you. It does not quote prices or doses, because a dose is a clinical decision rather than patient information. It does not suggest that a second laser session clears post-laser pigment, that pigment which has been lost will return, or that any treatment removes the change completely. It publishes no emergency telephone number, room number or opening hours of its own.
The facts kept visible
Four facts are repeated wherever they are relevant. Inflammation wakes the pigment cells, so the change appears two to four weeks after the session rather than on the day. Sun exposure in the weeks after treatment is the most common reason it deepens. The melanin that makes the treatment work is the same melanin that reacts to it, which is why darker skin carries more risk. And a device applied to skin that is still changing can deepen the colour rather than clear it, which is why the answer to most questions here is an interval rather than a treatment.
How the content is reviewed and corrected
Ke He, MD, Deputy Director and Head of Skin & Laser Aesthetics, is the responsible physician. Every guide is reviewed against her clinical judgement before publication and reviewed again on a six-month cycle. If you find something unclear, out of date or wrong, the contact page explains how to tell us, and corrections are made to the page itself.