Dark Spots and Hyperpigmentation: What Causes Them and What Helps

Why skin makes extra pigment

Melanin is produced by cells called melanocytes as a defence against ultraviolet (UV) light. When these cells are stimulated by sun, heat, hormones or inflammation, they can produce more pigment than needed and deposit it unevenly.

Darker skin tones have more active melanocytes. That gives better natural protection against sunburn, but it also means a pimple, an insect bite or an aggressive treatment is more likely to leave a dark mark behind.

The three most common types

• Sun spots (solar lentigines): small, flat brown spots on the cheeks, nose, forehead and hands that build up after years of sun exposure.
• Melasma: larger, symmetrical brown or grey-brown patches on the cheeks, upper lip and forehead. It is linked to hormones (pregnancy, oral contraceptives), sunlight and visible light, and heat. It tends to come back and needs long-term management.
• Post-inflammatory hyperpigmentation (PIH): dark marks that appear where skin was inflamed or injured — after acne, eczema, a burn or picking.

Sunscreen is the foundation

No brightening serum can outpace daily sun exposure. UV light restarts pigment production every day, so treatment without sunscreen usually stalls.

Use a broad-spectrum sunscreen of SPF 30 or higher every morning, including on cloudy days and indoors near windows. Apply roughly two finger-lengths for the face and neck, and reapply every two to three hours when outdoors. For melasma, tinted sunscreens containing iron oxides add protection against visible light.

Ingredients that help fade dark spots

These ingredients work by slowing pigment production or speeding up the turnover of pigmented cells. Introduce one at a time, and expect to wait 8 to 12 weeks.

• Vitamin C (ascorbic acid): an antioxidant that brightens and supports sun protection. Best used in the morning under sunscreen.
• Niacinamide: reduces the transfer of pigment to surface skin cells and is well tolerated by most skin types.
• Azelaic acid: useful for both acne and the marks it leaves; generally safe in pregnancy.
• Alpha arbutin and kojic acid: gentle tyrosinase inhibitors that reduce new pigment.
• Retinoids: speed up cell turnover so pigmented cells shed faster. Start slowly to avoid irritation, which can itself cause more pigmentation.

What to avoid

Be cautious with unregulated "fairness" or "skin-lightening" creams. Some contain potent steroids or mercury, which can thin the skin, cause acne and stretch marks, and make pigmentation much worse once stopped. Strong prescription agents such as hydroquinone should only be used under a doctor's supervision.

Harsh scrubs, lemon juice, baking soda and other DIY remedies irritate the skin and often deepen pigmentation rather than lighten it.