Dark spots, also known as hyperpigmentation, are areas of skin that appear darker than the surrounding skin. They're caused by an overproduction of melanin, the pigment that gives skin its colour, and they're one of the most common skin complaints there is. The good news: most dark spots respond well to treatment. The catch: it takes months, not days, and nothing works without sun protection. Here's the full picture.
What causes dark spots?
Sun exposure is the biggest driver. When skin is exposed to UV, it produces extra melanin to protect itself. Over years, that response becomes uneven and shows up as sun spots (also called age spots or liver spots), typically on the face, hands and chest.
Post-inflammatory hyperpigmentation (PIH) is the mark left behind after skin injury or inflammation, most commonly acne, but also cuts, burns and eczema flares. The inflammation triggers local melanin production, and the spot lingers long after the blemish heals. This is also why you shouldn't pop your pimples; picking dramatically increases the odds of a lasting mark. PIH is more common and more stubborn in deeper skin tones.
Hormonal changes cause melasma, larger patches of pigmentation often triggered by pregnancy or birth control pills, usually across the cheeks, forehead and upper lip. Melasma is the trickiest type to treat and the most prone to returning.
Step one, always: sunscreen
Every treatment below is fighting a losing battle if the spots keep getting UV exposure, because sunlight directly stimulates the melanin production you're trying to suppress. A broad-spectrum SPF 30 or higher, worn every single day including cloudy ones, is the foundation. For existing spots, sun exposure makes them darker; for treated spots, it brings them back. Here's why SPF is non-negotiable.
Topical treatments that actually fade dark spots
These are the evidence-backed ingredients, roughly in order of accessibility:
- Vitamin C: an antioxidant that inhibits melanin production and brightens overall tone. Use it in the morning under SPF.
- Retinoids: retinol or prescription tretinoin speed up cell turnover, so pigmented cells are shed and replaced faster. The workhorse of most dark spot routines.
- Azelaic acid: underrated, gentle, and particularly good for PIH and melasma. Also safe during pregnancy, unlike retinoids.
- Niacinamide: blocks the transfer of melanin to skin cells and pairs well with everything. Here's how to add it to your routine.
- Exfoliating acids (AHAs): glycolic or lactic acid used a few nights a week accelerates the shedding of pigmented surface cells.
- Hydroquinone: the strongest topical lightener, available via prescription in the UK. Effective, but should be used in supervised courses because of irritation and rebound risks.
A realistic routine: vitamin C plus SPF in the morning, a retinoid at night, and an AHA two nights a week in place of the retinoid. Introduce one product at a time and patch test first.
Professional treatments
When topicals aren't enough, a dermatologist or qualified aesthetician can go further:
- Chemical peels remove the top layer of skin with a stronger acid concentration than home products, stimulating fresh, evenly pigmented skin.
- Microdermabrasion physically exfoliates the surface layer with a diamond-tipped wand. Gentler, suited to mild surface pigmentation.
- Laser treatments target melanin directly, breaking it down so the body clears it. Highly effective for sun spots, but requires an experienced practitioner, especially on deeper skin tones where the wrong laser can worsen pigmentation.
How long does it take?
Set expectations honestly: superficial PIH typically fades over 3 to 6 months with consistent treatment. Deeper pigmentation and melasma can take 6 to 12 months, and melasma often needs ongoing maintenance. If a dark spot is new, growing, irregular in shape or colour, or bleeding, skip the skincare aisle and see a GP or dermatologist promptly to rule out anything serious.
The bottom line
Dark spots come from sun, inflammation or hormones, and they respond to a consistent combination of daily SPF plus a melanin-inhibiting active like vitamin C, a retinoid or azelaic acid. Professional peels and lasers can accelerate stubborn cases. Be patient, be consistent, and protect the progress with sunscreen, because the sun is both the biggest cause and the fastest way to undo months of work.