De-tan products are often bought for skin that is not tanned. The darkness people call a stubborn tan is often pigmentation, which behaves differently and does not respond to the same things. It happens the other way round too: people start strong pigmentation products for what is only a summer tan that would have faded by December.
Both are melanin. The difference is in why it was made and how it is arranged.
What a tan is
A tan is the skin's general response to ultraviolet light. Every pigment cell in the exposed area makes more melanin and passes it to the cells around it. The result is an even deepening of colour across all the skin the light reached. How to fade a tan describes the process.
When the exposure stops, production drops back, and the extra pigment leaves as the skin renews. Nothing is wrong with the skin. It has reacted in the ordinary way and will return to where it was.
What pigmentation is
Pigmentation, in the sense people mean when they complain of it, is melanin collected in particular places. Something local has told the pigment cells in one patch to work harder than their neighbours, and they carry on after the trigger has gone.
The common kinds are marks left after acne or an injury, the symmetrical patches of melasma, and the small, defined sun spots that appear with years of exposure. How to fade dark spots describes how to tell these from each other.
Five ways to tell
Pattern. A tan is uniform. It covers the forehead, cheeks, nose and chin together, and the whole forearm, not parts of it. Pigmentation comes in patches or spots with edges you could trace.
Lines. A tan stops at a watch strap, a collar or a sleeve. Pigmentation ignores clothing. Melasma tends to sit on the cheekbones, forehead and upper lip. Marks from acne sit where the acne was.
Timing. A tan shows up within days of sun and starts to lighten within weeks of avoiding it. Pigmentation often appears gradually, or follows a breakout or a pregnancy, and holds through months of careful protection. If darkness has outlasted a normal tan, the tan fade calculator says so.
Winter. By the end of a cool season with covered arms, a tan has faded or nearly gone. Darkness that looks the same in February as it did in September is not a tan.
Covered skin. Compare the area with skin that never sees the sun, such as the inner upper arm. If the whole exposed area is evenly deeper than that, it is a tan. If only parts of it are, those parts are pigmentation.
Many people have both. A tanned face with darker patches on the cheeks is a tan over melasma or over old acne marks, and the patches will still be there when the tan has gone.
Does a tan ever become lasting?
A single tan does not. It always fades if the exposure ends.
Two things make it seem otherwise. The first is that the exposure never really ends. A daily commute tops up the tan faster than the skin clears it, so it looks fixed.
The second is that years of repeated tanning do leave lasting changes. Sun spots, uneven tone and a rougher texture build up slowly and do not fade the way a tan does. That is accumulated sun damage. It gets handled as pigmentation because by then it is pigmentation.
Why the difference matters
A tan needs protection from the sun and patience. Gentle exfoliation and a moisturiser help it look better on the way. Strong actives are unnecessary.
Pigmentation needs identifying first, because the kinds differ. Marks left by acne fade with time and a tone-evening routine. Melasma is persistent, linked to hormones and light, and often needs a dermatologist. Melasma or ordinary pigmentation explains the split, and the fade timeline tool gives a realistic range for each type.
De-tan packs and scrubs can make pigmentation worse. They work by exfoliating, and irritated patches make more pigment. What a de-tan pack does covers the limits.
One thing they share
Sunlight drives both. It causes a tan, and it darkens existing pigmentation more than the skin around it, which is why patches stand out most in summer. Daily sunscreen is the first step for either one. How to use sunscreen on your face covers the amount and the timing.
When to see a doctor
See a dermatologist for patches that are spreading, for darkening that began with a new medicine, and for skin that has become thick or velvety in the folds.
A single spot that is changing in size, shape or colour, has an irregular edge, or bleeds should be seen promptly.
Darkening with no sun and no obvious cause also deserves a medical opinion. Skin getting darker without sun lists the usual reasons.
Cham makes no sunscreen, which is the most important product for both problems. The Brightening Face and Body Serum carries niacinamide and is part of a slow routine for uneven tone. It does not speed up a tan, and it is no substitute for a diagnosis when the pattern points to melasma.
