In short. How pigment and vascular concerns are assessed and treated with light-based devices: diagnosis first, skin-type-dependent risk, course-based treatment, and honest recurrence rates.
Key points
- Melasma responds to a programme: rigorous sun protection, topical therapy, and carefully chosen low-energy light-based support where appropriate — reviewed over months.
- Aggressive high-energy treatment is a recognized cause of rebound darkening.
- Any plan that promises to remove melasma permanently in a few sessions is describing an outcome medicine cannot currently deliver.
Brown spots and red marks look simple and are not. Pigment concerns — sun spots, freckles, melasma, post-inflammatory darkening — and vascular concerns — visible vessels, diffuse redness, red marks after acne — each arise from different biology, respond to different light-based targets, and carry different risks. Treating them well starts with diagnosis, not with a device.
Diagnosis before wavelength
Light-based devices work by being absorbed by a target: melanin for pigment, haemoglobin for vessels. The wrong target, or the wrong depth, wastes sessions or causes harm. Melasma in particular behaves differently from ordinary sun spots — it is chronic, hormonally and ultraviolet-driven, and notoriously prone to rebound if treated aggressively. A correct diagnosis decides whether energy treatment is even the right tool, or whether topical and protective management should lead.
Skin type is a safety variable
Darker and recently tanned skin contains more melanin in the epidermis, which competes for the same light meant for the target. Ignoring this is the commonest route to post-inflammatory pigmentation — trading a spot for a larger stain. Assessment of skin type and recent sun exposure sets the device choice, the settings, and sometimes the decision to defer treatment until tan fades.
Melasma is managed, not zapped
Melasma responds to a programme: rigorous sun protection, topical therapy, and carefully chosen low-energy light-based support where appropriate — reviewed over months. Aggressive high-energy treatment is a recognized cause of rebound darkening. Any plan that promises to remove melasma permanently in a few sessions is describing an outcome medicine cannot currently deliver.
Courses, intervals, and honest recurrence
Pigment and vascular treatments are courses: sessions spaced weeks apart, with crusting or temporary darkening of pigmented spots as a normal stage before they clear. Vascular lesions often need several sessions and some vessels simply return over time. Sun exposure between sessions undermines everything; protection is treatment, not advice.
Risks, stated plainly
Recognized risks include burns and blistering, prolonged redness, post-inflammatory pigmentation, pigment loss, and rare scarring. Risk concentrates where skin type is ignored, settings are aggressive, or aftercare — especially sun protection — is skipped.
Seek review before or promptly after treatment if
- A pigmented spot has changed in size, shape, or colour, or bleeds — it needs medical assessment before any cosmetic treatment.
- Treated skin darkens progressively over the weeks after a session rather than clearing.
- You plan treatment while tanned, pregnant, or on photosensitizing medication — timing must be reviewed first.
Frequently asked questions
Why is melasma treated differently from ordinary sun spots?
Melasma is chronic and driven by hormones as well as light, and it is prone to rebound when treated aggressively. Sun spots sit close to the surface and clear reliably with light-based treatment; melasma is managed over months with protection, topical therapy and cautious low-energy support at most.
Why does darker or recently tanned skin change the laser plan?
Extra melanin in the epidermis competes for the light intended for the target, which is the commonest route to post-inflammatory pigmentation. Assessment of skin type and recent sun exposure sets the device, the settings, and sometimes the decision to defer until a tan fades.
Will treated pigment stay away permanently?
Not necessarily. Pigment cells keep responding to ultraviolet, and vascular lesions often need several sessions with some vessels returning over time. Protection between sessions is treatment rather than advice, because unprotected skin repigments faster than it cleared.
Risks & Limitations
- Vascular occlusion — a time-critical emergency in which filler blocks a blood vessel. It can cause skin loss and, rarely, blindness.
- Nodules, lumps or granuloma formation, which may need treatment or dissolution.
- Infection at the injection site.
- Asymmetry or over-correction; over-treatment is harder to correct than under-treatment.
- Migration of filler away from the intended area.
- Temporary brow or eyelid droop after botulinum toxin, which resolves as the effect wears off.
- Bruising and swelling. All injectable results are temporary and maintenance is required.
When to Seek Care
- Severe pain out of proportion to the procedure, or skin turning white, grey, mottled or dusky — this is a vascular emergency; seek care immediately.
- Any change in vision — seek emergency care immediately.
- Fever, spreading redness, warmth or pus at an injection site.
- A hard, painful lump that is growing.
- Drooping eyelid, difficulty swallowing, or difficulty breathing after botulinum toxin.
References & Further Reading
- American Academy of Dermatology (AAD) — injectable safety information
- American Society of Plastic Surgeons (ASPS) — injectable guidance
- U.S. Food and Drug Administration (FDA) — approved filler and neurotoxin products
- National Medical Products Administration (NMPA, China) — approved product status
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.