What this site is for
It exists to help someone decide whether to have this treatment. The medical system itself — how light interacts with pigment and haemoglobin, the device classes, the indication lists — is documented in the hospital's laser and light-based aesthetics subject site and in Dr. He's professional site. Repeating that material would add nothing. What is often missing is the patient's side of the decision: whether your skin type is suitable, how many sessions a course takes, what the week after each one is actually like, and when the honest answer is no.
How it is written
Every guide follows one decision from beginning to end and states its limits as plainly as its benefits. Where the treatment is the wrong match for a problem, the text says so. Where an outcome depends on how a patient's skin responds rather than on what a clinician does, the text says that too. Nothing here is written to make a course of light treatment sound more powerful than it is, and the fact that the gains are incremental is stated on every page where it matters.
What it will not do
It will not name brands of drugs or devices: light sources and technologies are described by class only. It will not quote prices, because cost depends on the plan and the plan depends on an assessment. It will not publish dosages, energy settings or wavelengths, and it will not invent credentials, awards or case volumes for any clinician.
Medical review
The content is reviewed by Ke He, MD, Deputy Director and Head of Skin & Laser Aesthetics at Chongqing West District Hospital, and is dated on every page. It is patient education, not medical advice: it does not describe your case, and it does not replace an assessment by a qualified clinician who has examined your skin.