Pigmentation concerns are some of the most common reasons people seek skin treatments — including freckles, sun spots (solar lentigines), age spots, uneven tone, and post-acne marks. But with so many devices and “laser types” available, it’s completely reasonable to wonder: how do clinicians decide which laser is right, and why?
At Medical Aesthetics 360, our approach is not “one laser fits all.” Our logic is a decision mix of clinical evidence, hands-on experience, and your individual skin factors — including pigmentation type, depth, stability, and your risk of post-inflammatory hyperpigmentation (PIH). Below is a simplified framework to understand how that decision-making works.
Step 1: Categorise Pigmentation in a Simple, Clinical Way
To make laser selection easier to understand, we often divide pigment into four categories using two key questions:
1) Is it stable or non-stable?
2) Is it dermal or epidermal?
That gives four buckets:
• Stable + Epidermal
• Stable + Dermal
• Non-stable + Epidermal
• Non-stable + Dermal
This matters because depth and stability influence which wavelength (or light-based approach) is most likely to deliver a good result safely and predictably.
Step 2: Stable vs Non-Stable Pigmentation — Why It Matters Most
For results to be truly good, the most important factor is stability. Clearing pigment that rapidly returns — or becomes patchier — is frustrating and can increase the risk of ongoing sensitivity.
Stable pigmentation is generally more predictable and often responds well when the correct device is matched to the correct depth. Examples include freckles, solar lentigines (sun spots/age spots), seborrhoeic keratoses, and some deeper lesions such as nevus of Ota (which usually needs careful long-term planning).
When we use the word “stable,” it’s often in relative comparison to melasma — which is typically non-stable and reactive whether it appears dermal or epidermal. With non-stable pigment, more aggressive treatment is not always better; controlling triggers and minimising inflammation becomes part of the plan.
Step 3: Epidermal vs Dermal Pigment — Depth Drives Device Choice
Epidermal pigment sits closer to the surface. Many freckles and sun spots have a stronger epidermal component, so they can respond more quickly, sometimes with fewer sessions. Depending on your skin tone, history, and timing (such as recent sun exposure), epidermal pigment may respond to IPL and targeted wavelengths such as 532 nm and 755 nm.
Dermal pigment sits deeper and can appear more grey, blue, or “shadowed.” Deeper pigment generally requires wavelengths with greater penetration. In many treatment plans, 755 nm and 1064 nm are considered because they can reach deeper targets compared with shorter wavelengths. Depth is also why a thorough assessment is essential: treating deeper pigment as if it were superficial can lead to disappointing outcomes or unnecessary irritation.
Step 4: The “Hidden Boss Level” Factor — PIH Risk
Even with an accurate pigment diagnosis, PIH (post-inflammatory hyperpigmentation) can shape the entire approach. PIH is when the skin darkens after heat or inflammation — and it can occur after lasers, strong actives, excessive sun exposure, or even friction in prone individuals.
In general, PIH risk tends to be higher with certain choices. A simplified way to think about relative risk is:
• 532 nm: higher PIH risk
• 755 nm: moderate PIH risk
• 1064 nm: generally lower PIH risk
This is one reason why two people with “similar-looking” freckles may receive different recommendations. At Medical Aesthetics 360, we select settings and devices with a bias toward safer, more stable outcomes — especially for patients with a history of pigment rebound or inflammation.
Step 5: The Real Logic — A Clinical Decision Tree, Not a Random Pick
When we recommend a pigmentation treatment plan, we’re essentially using a clinical decision tree:
• What is the likely diagnosis (freckles, solar lentigo, melasma, PIH, mixed pigment)?
• Is it stable or reactive?
• Is it epidermal, dermal, or mixed depth?
• What is the PIH risk profile?
• What downtime and timeline are acceptable?
• What maintenance will keep results stable long-term?
This is also why good pigment management is more than one appointment. It can include skin preparation, appropriate spacing between sessions, and strong sun-protection habits to reduce rebound pigment and support a more even tone.
Book a Pigmentation Assessment at Medical Aesthetics 360
If you’re dealing with freckles, sun spots, uneven tone, or pigment that keeps returning, a targeted assessment can save you time, cost, and frustration.
At Medical Aesthetics 360, we assess pigment stability and depth, your PIH risk, and your skin’s overall tolerance — then tailor a plan using a conservative, evidence-informed approach that prioritises natural-looking, stable results.
To get started, book a consultation with our team and let’s create a personalised pigmentation plan that fits your skin and your goals.
Disclaimer
This article is general information only and does not constitute medical advice. Suitability for laser or light-based treatments depends on individual factors including skin type, medical history, pigmentation depth, and risk of complications such as irritation or post-inflammatory hyperpigmentation (PIH). Results vary between individuals and no outcome can be guaranteed. A consultation with a qualified clinician is required to determine the most appropriate treatment plan for you.
