Melasma, PIH, or Sun Damage? An Esthetician's Assessment Guide

Hey fellow pros! We’ve all been there: a client sits in your chair, points to a dark patch on their cheek, and says, "I just want this spot gone." It can be tempting to reach straight for your strongest peel or microdermabrasion tip, but as skin care professionals, we know that treating hyperpigmentation without identifying the root trigger is a fast track to rebound pigment or barrier damage.

We've all had this consultation. And in that moment, before we say a single word about treatment, our real job begins — because "dark spots" are not a diagnosis. It's three or four completely different conditions that happen to look similar at first glance, and each one has its own triggers, its own behavior, and its own safe treatment limits.

A successful pigmentation consultation follows a strict sequence: Observe First, Question Second, Categorize Third, and Treat Safely.

Step one: observe before you ask

Before the questions start, look. Really look — in good lighting, and ideally with the skin cleansed. You're reading the pattern, and the pattern tells you most of the story before the client says anything.

Here's what I'm scanning for:

• Symmetry. Is it showing up evenly on both sides of the face, or is it scattered and one-sided? Symmetry is one of the biggest tells.
• Location. Cheeks, forehead, and upper lip? Or is it sitting exactly where old breakouts were? Or across the high sun-exposed zones — the tops of cheeks, chest, backs of the hands?
• Border and shape. Is it a soft, diffuse, blurry patch, or are there discrete, spot-shaped marks with defined edges?
• Color. Brown and blotchy? Grey, brown? Red brown? Tan clusters that look almost freckled?
• Texture. Is the skin smooth, or is there roughness, dullness, and that crepey photoaged quality alongside the pigment?

I also note the Fitzpatrick type and — this one matter — whether there's any active acne, open skin, or a compromised barrier, because that changes what we're allowed to do immediately.

Once you've read the pattern, the questions confirm what your eyes are already telling you.

Step two: ask the right questions

This is the part we do naturally, but it helps to be deliberate about it. Every question is designed to point toward a cause.

• "When did the spot first appear?" Sudden vs. gradual onset is a clue.
• "Does it get worse in the summer, or with sun and heat?" Both melasma and sun damage flare with UV, and melasma is notoriously heat-reactive.
• "Did this start with pregnancy, birth control, or a hormone change?" This is your classic melasma question. Hormones are primary drivers.
• "Did a breakout, rash, or injury come first — right in that exact spot?" If the pigment is sitting where inflammation was, you're likely looking at PIH.
• "Do you pick, wax, or use strong actives at home? Any peels, lasers, or procedures in that area?" Trauma and over-treatment feed PIH.
• "What do your daily SPF habits look like? How much sun or tanning?" This frames everything.
• "Is any spot changing — in size, shape, or color?" Never skip this one. It's your safety question, and we'll come back to it.

Now let's connect what you saw and heard to the three usual suspects.

How to Differentiate: Melasma, PIH, and Sun Damage

Melasma — hormonal, reactive, persistent

Melasma is the tricky one. It's usually symmetrical, showing up in patchy, diffusing patches across the cheeks, forehead, and upper lip. The pigment tends to be brown or grey-brown and blotchy rather than sharply defined. The triggers are a combination: hormones + heat + UV and visible light. It flares, it recurs, and it does not respond well to aggression.

The mindset here is conservative. Stay low inflammation. Avoid aggressive heat, strong peels, and over-treatment during a flare. Daily broad-spectrum SPF with visible-light protection isn't optional — it's the foundation of the whole plan. Think of melasma as something we manage patiently, not something we blast away.

Post-inflammatory hyperpigmentation (PIH) — a result of inflammation

PIH is the mark left behind by inflammation. It appears after a breakout, rash, or injury, and the giveaway is that the shape of the pigment often matches the previous inflammation — you can practically trace where the acne or irritation was. The marks are irregular, and they can read red, brown, or dark. It's especially common in deeper skin tones. The good news we get to share: PIH generally improves over time as the skin heals.

The golden rule with PIH is calm the inflammation first. Never treat overactive acne, open skin, or irritation — that just creates more of the exact problem you're trying to fix. Work with gradual brightening and strong barrier support and save more active professional treatment for when the skin is genuinely healed.

Sun damage — cumulative exposure, visible changes

Sun damage is the story of years of UV, written on the skin. It's typically scattered rather than symmetrical, showing up as brown spots and uneven tone on the sun-exposed areas — face, chest, and the backs of the hands. It often comes with rough texture and dullness, because it's part of the broader photoaging picture. The root cause is simple: chronic, cumulative UV.

Here, brightening, antioxidants, and gentle resurfacing are usually well tolerated when the barrier is intact. Avoid over-peeling, and daily SPF is genuinely non-negotiable — you're not just treating what's there, you're preventing the next decade of it. And critically: avoid treating suspicious or changing spots and refer out if anything looks irregular.

The quick mental shortcut

When you're mid-consultation and need to sort it fast, this is the shorthand I keep in my head:

• Melasma = Hormones + Heat + UV
• PIH = Inflammation
• Sun Damage = Chronic UV

Three triggers, three different treatment ceilings. Same-looking spots, completely different care.

When referring to a dermatologist

This is the most important section, and I want to be direct about it: we are estheticians, not diagnosticians. Our scope is beautiful, meaningful work — but part of doing it professionally is knowing exactly where our lane ends. When in doubt, refer. It protects the client, and it protects you.

Send a client to a dermatologist when:

• Any spot is changing — in size, shape, color, or border.
• A lesion shows the ABCDE warning signs: Asymmetry, irregular Borders, more than one Color, Diameter over about 6 mm, or evolving/changing over time.
• A lesion bleeds, crusts, itches, or won't heal.
• There's a single new dark spot in an older client.
• Pigment is rapidly spreading or resistant to appropriate treatment.
• You simply aren't sure. An unnecessary referral costs nothing. A missed one can cost everything.

None of this replaces a medical assessment — it's a professional judgment call about when something is outside our scope. Make that call generously.

Pigment Assessment Sheet

Take the Pigment Assessment sheet into the room with you

To make all of this fast at the chair, I put together a one-page Facial Pigment Assessment Sheet you can download, print, and keep in the treatment room. It walks through the same flow we just covered — observe, ask, match the pattern, check the referral flags — plus a clean side-by-side comparison of melasma vs. PIH vs. sun damage and the Dermishop professional picks for each.

➡️ [Download the free Facial Pigment Assessment Sheet (PDF)] — print it, laminate it, and let it do the remembering for you during consultations.

Because the better we get at reading pigment, the better our results — and the more our clients trust us to guide them. Knowledge builds brighter skin. 💜

Educational guide only. Not a medical diagnosis. Always patch test, protect the skin barrier, and refer to a dermatologist for rapidly changing, irregular, or treatment-resistant pigmentation.

In my next post, I'll share some of the professional products I reach for in the treatment room for each of these three pigment types.