Education, not medical advice
The content on this site is general patient education. It is not a diagnosis, not a treatment recommendation, and not a substitute for a consultation with a clinician who has examined you. Which of the three pigment changes is present cannot be decided from a page, a photograph or a description: when in doubt, make the call or attend.
The findings that need immediate care
Blistering, weeping or severe pain in a treated area, skin that is peeling away, fever with spreading redness, heat or pus, patches of skin turning white, a mole or spot that changes, bleeds or ulcerates, darkening that spreads beyond the treated area, and any eye symptom after treatment near the eye all require care without delay. Do not wait to see whether they settle.
What treatment can and cannot do
Pigment that has increased after a laser session often fades over months, helped by sun protection. It cannot be guaranteed to clear, and a further laser session given too soon can deepen it rather than remove it. Pigment that has been lost is the harder problem: the colour frequently does not return, and the treatments available for it are limited and partial.
When to seek care
For anything in the emergency list, seek care the same day or immediately as that list requires. For colour that is not settling but is not in the list, contact your treating team and describe it. Do not start a cream that was not prescribed for you, do not use a home device on the area, and do not arrange another laser session on your own initiative.