How your skin makes pigment
Dark spots can feel mysterious and stubborn. They become far more manageable once you understand the four steps that produce them — because every treatment on the market interrupts one of those steps.
Step 1 — The pigment cell gets a signal.
Melanocytes (pigment cells) sit at the base of your epidermis. UV light, inflammation, and hormones all send them signals telling them to produce pigment. UV triggers a messenger called plasmin; inflammation and hormones have their own routes.
Step 2 — The cell makes melanin.
Using an enzyme called tyrosinase, the melanocyte produces melanin — the pigment that colours your skin. Tyrosinase is the factory machine.
Step 3 — The melanin is transferred.
Melanin is packaged and passed to surrounding skin cells (keratinocytes), which carry it upward.
Step 4 — It reaches the surface.
About 28 days later, that pigment arrives at the surface, where you see it — as tan, or as a dark spot.
Every treatment blocks one step
This is the useful part. Once you map treatments onto the four steps, the logic of combining them becomes obvious:
Blocking Step 1 (the signal):
- Tranexamic acid — blocks plasmin, the messenger UV uses
- Sunscreen — stops the UV signal from ever being sent. The most upstream intervention there is.
- Niacinamide and azelaic acid — reduce inflammation, another trigger
Blocking Step 2 (making melanin):
- Hydroquinone — the strongest tyrosinase blocker. The gold standard.
- Kojic acid, arbutin, azelaic acid — gentler tyrosinase blockers
- Vitamin C — slows tyrosinase and neutralizes free radicals
Blocking Step 3 (transfer):
- Niacinamide — the best-known blocker of pigment transfer
- Retinoids
Accelerating Step 4 (shedding pigmented cells):
- Retinoids — speed up turnover, pushing pigmented cells off faster
- Chemical peels and exfoliating acids
- Lasers — break up pigment for removal
Why this matters practically: combining treatments that hit different steps works far better than stacking two that do the same thing. Hydroquinone (step 2) plus a retinoid (steps 3 and 4) plus sunscreen (step 1) is the classic combination — and it's classic precisely because it attacks the process from three directions.
And it explains why sunscreen isn't optional. Sunscreen blocks step 1, the very beginning of the process. Treating dark spots without sunscreen is like bailing out a boat without plugging the hole. You can put in real work and get nowhere.
Types of pigment
They look similar and behave very differently.
Post-inflammatory hyperpigmentation (PIH). Brown spots left after inflammation — acne, a cut, a burn, eczema. Very common in medium and darker skin tones. Fades on its own over months, and treatment speeds it up.
Post-inflammatory erythema (PIE). The red or pink version, from damaged tiny blood vessels rather than pigment. More common in fairer skin. Doesn't respond to pigment treatments — it needs vascular laser (VBeam/PDL), azelaic acid, or niacinamide. Worth knowing, because people treat this with brighteners for months and wonder why nothing happens.
Melasma. Symmetrical brown or grey-brown patches, typically on the cheeks, forehead, and upper lip. Driven by hormones plus UV. This is the stubborn one. Unlike PIH, it doesn't simply fade — the pigment cells stay switched on, and it's chronic. Treatment is long-term control, not a cure.
Sun spots (solar lentigines). Flat brown spots on sun-exposed skin — face, hands, chest. From cumulative UV. Respond well to lasers.
Freckles. Genetic, darken with sun. Harmless.
The rules of treating pigment
1. Sunscreen, daily, without exception. SPF 30+, broad spectrum, reapplied. This is not the boring preamble — it is the treatment. Without it, everything else fails.
For melasma specifically, consider iron oxides (in tinted sunscreens), which block visible light as well as UV. Visible light — including from screens — worsens melasma, and standard sunscreens don't stop it.
2. Treat the cause first. Fading acne marks while acne is still active is pointless — each new pimple makes a new mark.
3. Be patient. Pigment takes 8–12 weeks minimum, often longer. Skin turns over roughly monthly, and deeper pigment far more slowly.
4. Don't irritate. Inflammation causes pigment. Aggressive treatment often makes dark spots worse — a genuine trap, especially in darker skin tones. Gentle and consistent beats harsh and fast.
5. Combine, don't escalate. Two treatments hitting different steps beat one used aggressively.
Realistic expectations
PIH: fades over 3–12 months, faster with treatment. Good outcomes.
Sun spots: respond well, especially to lasers.
Melasma: improves, then comes back without maintenance and sun protection. This is the honest truth about melasma, and being told it upfront saves a lot of disappointment.
Deeper (dermal) pigment is much harder to treat than surface pigment, and may only partially improve.
FAQ
Why isn't my dark spot cream working?
The most common reason: you're not wearing sunscreen. UV directly reverses everything a brightener does. The second most common: you haven't waited long enough — pigment takes 8–12 weeks minimum.
What's the strongest thing for dark spots?
Hydroquinone. It blocks tyrosinase directly. Prescription-only in the US, and used in courses of 8–12 weeks with breaks — continuous use risks ochronosis, a permanent blue-grey darkening.
My spots are red, not brown. Why is nothing working?
Because red marks (PIE) are blood vessels, not pigment. Brighteners can't touch them. You need vascular laser (VBeam), azelaic acid, or niacinamide.
Will my melasma ever go away?
It can be cleared — but it's chronic, and it returns without maintenance and rigorous sun protection. Manage it as an ongoing condition, not a one-time fix.
Can I use several brightening ingredients together?
Yes — and you should, if they hit different steps. Hydroquinone (step 2) + retinoid (steps 3–4) + sunscreen (step 1) is the classic stack. Just don't over-irritate: inflammation makes pigment worse.
Do lasers fix dark spots?
Sun spots, yes — very well. Melasma, cautiously — the wrong laser or too much heat can make melasma dramatically worse. Never let someone inexperienced laser melasma, especially in darker skin.
Does my phone or laptop screen worsen melasma?
Possibly, though the light from screens is far weaker than daylight. Visible light does worsen melasma, and standard sunscreens don't block it. A tinted sunscreen with iron oxides does — and it's a genuinely worthwhile upgrade if you have melasma.
I'm pregnant and got melasma. What can I use?
Azelaic acid is the standard safe choice, plus niacinamide, vitamin C, and rigorous sun protection. Avoid hydroquinone and retinoids. Pregnancy melasma often fades on its own afterward.