Pigmentation: why the patches form and how to fade them

Dark patches on brown skin are almost never one problem. Melasma, post-acne marks, a persistent tan and a fungal patch need four different plans, and the commonest reason pigmentation gets worse here is the cream being used to treat it.

Which pigment you are actually dealing with

Read this before buying anything, because the treatments differ and some of them make the wrong diagnosis worse.

• Melasma: symmetric, blurry-edged patches on the cheeks, upper lip, forehead or jaw, often tan to grey-brown. Worsens in summer, in pregnancy, and on the pill. Comes back. This is the hardest one.
• Post-inflammatory marks: flat brown or dark spots left behind by a pimple, a scratch, eczema or a harsh treatment. They fade on their own in three to twelve months and speed up with sun protection.
• A tan or sun spots: uneven, on the exposed areas, with a clear history of outdoor seasons or driving. Spots with sharp edges on the temples and cheeks in an older person are solar lentigines.
• Around the eyes: brown, sometimes with a hollow and a violet tint. Mostly genetics, sleep, allergy and rubbing, and the least responsive of the group to any cream.
• A scaly, itchy, ring-shaped or one-sided patch is not pigmentation. That is often fungal, and a lightening cream on top of a fungal infection is exactly how these spread.

Why brown skin marks so easily

Melanocytes in brown skin are reactive. Inflammation, friction, heat, a strong peel, an acne lesion squeezed at a parlour, or a hair-removal cream left too long, and the pigment cells respond by over-producing and dropping colour into the deeper layer, where it is much slower to clear. This is why the aggressive approach fails: you are trading a mark you could have faded for a deeper one that will take two years. Heat matters as much as light, so kitchens with an open flame, long sun-facing commutes, and sitting in afternoon sun on a balcony all feed melasma even when sunscreen is being worn.

The step that decides everything else

Nothing in this article works without daily photoprotection, and that is not a moralising line, it is the mechanism. Broad-spectrum SPF 30 to 50 every morning, including on cloudy days and indoors if you sit near a window, a finger-length for the face and neck, reapplied every three hours when outdoors. Tinted sunscreens with iron oxides are the meaningful upgrade for melasma in brown skin, because visible light drives pigmentation here and a white untinted filter does not block it. Add a cap, a handkerchief over the face on a bike, and sunglasses. If you will not do this, spend the money on nothing else.

The actives, in the order worth trying

• Niacinamide 4 to 5% in the morning. Cheap, well tolerated, blocks pigment transfer, and doubles as the moisturiser step for oily skin.
• Azelaic acid 10% over the counter, 15 to 20% by prescription. The most useful single ingredient in this list for brown skin: it works on melasma and post-acne marks, is safe in pregnancy, and does not irritate into more pigment.
• Vitamin C as L-ascorbic acid 10 to 15%, or a stabilised derivative if that stings. Best in the morning under sunscreen. It oxidises in a hot bathroom, so a small bottle used up fast beats a big one.
• Alpha arbutin, kojic acid and liquorice extract, in a serum once a day. Modest, additive, and worth it if the first three are already in place.
• A retinoid at night, adapalene or prescription tretinoin, which speeds turnover and lets the others work. Introduce it separately, not all at once, because irritation is the enemy.
• Hydroquinone is a prescription drug for a defined course, usually eight to twelve weeks, not a fairness cream to keep in the drawer for two years. Used continuously on brown skin it can cause ochronosis, a blue-black pigmentation that is far harder to treat than the original patch. The same argument applies to the triple-combination creams and to any tube containing clobetasol being sold as a glow treatment.
• Oral tranexamic acid has genuine data for stubborn melasma and works by a different route. It is a prescription decision with a clotting history in front of the doctor, and it is not a supplement.

Kitchen measures, honestly sorted

Aloe vera applied to melasma has small trials behind it, and is a reasonable moisturiser. Oat and liquorice preparations have some evidence. Turmeric, sandalwood and besan packs are pleasant, mildly soothing and will not lift a pigment patch; the harm is the daily scrubbing motion used to take them off. Potato rub, tomato, lemon, apple cider vinegar, baking soda and toothpaste on dark patches have no evidence and a real record of chemical burns and worsened marks in the cases we see. A paste that stings is not working, it is damaging.

The things that quietly keep the patch going

Threading and waxing over active melasma. Bleach applied to the face. A parlour peel of unknown strength, or a glutathione drip. Stopping the cream the week the skin looks better rather than tapering. Skipping sunscreen because it makes the face grey. A hormonal contraceptive that suits your cycles and provokes melasma; that trade-off is a conversation with a gynaecologist, not a decision to stop protection. And an underactive thyroid or iron deficiency, both of which show up as dull, uneven skin and are found with a blood test.

How to layer, and how long to wait

Morning: gentle cleanse, vitamin C or niacinamide, moisturiser, sunscreen. Night: cleanse, azelaic acid or retinoid on dry skin, moisturiser. Introduce one new product at a time, two weeks apart, and photograph the face in the same light and same spot once a fortnight rather than examining it in a bathroom mirror every morning. Fading is slow by nature: post-acne marks twelve weeks, melasma three to six months before you can judge whether a plan is doing anything at all.

When a patch has to be seen and not treated

One spot that is changing in shape, colour or border, or has irregular notched edges; anything that bleeds, crusts, or itches without settling; a new dark streak on a nail; a dark patch appearing rapidly along with weight loss, tiredness and low blood pressure; a dark velvety thickening on the back of the neck or in the armpit, which is an insulin signal and not a cosmetic one; pigment appearing after starting a new medicine, particularly doxycycline, antimalarials or some tuberculosis drugs; or a patch that has not budged in six months of correct care. Melanoma on brown skin is uncommon and frequently presents late, precisely because everyone assumes a dark mark must be a tan.

How we look at it at Aksa

We examine in good light and with a magnifier rather than guessing from a photograph, and we ask what has already been applied and for how long, because a steroid-dependent face needs a different plan from a pigmentary one and the two look similar. Bloods when the picture suggests it: thyroid, haemoglobin and ferritin, vitamin D and B12, and sugar when there is insulin resistance. Then a routine with three or four products instead of eleven, sun protection that fits your actual day rather than a theoretical one, and the Ayurvedic management that supports the skin barrier, the sleep and the heat tolerance. Where the diagnosis is melasma we will tell you the truth at the first sitting: it can be controlled well and it comes back, and the person who does best is the one who keeps the sunscreen on in December.