Dark spots on darker skin: what fades them

People with medium and darker skin tones get dark spots more easily, and the spots often last longer. The reasons are well studied, and so are the steps that help. This guide covers why darker skin reacts this way, why light and irritation matter so much, and how to fade spots without causing new ones. It is part of Skinli's guide to hyperpigmentation.

Why darker skin gets more dark spots

The American Academy of Dermatology (AAD) explains that people with medium to dark skin tones get dark spots and patches because something triggers the skin to make extra melanin, the pigment that gives skin its color. On darker skin, many everyday things can be that trigger.

The AAD's list of common triggers:

• A pimple or a patch of psoriasis clears
• A wound from an insect bite, cut, burn or other injury heals
• You take or apply certain medicines
• A skin or hair care product irritates your skin
• Hormone changes, such as pregnancy

The medical name for spots left after inflammation is post-inflammatory hyperpigmentation. A 2010 review in the Journal of Clinical and Aesthetic Dermatology says it affects darker-skinned people more often and more severely. In one study it cites, pigment disorders were the third most common skin diagnosis among Black patients, at 9%, and the seventh most common among white patients, at 1.7%. The AAD says dark spots and patches are one of the most common reasons people with darker skin tones see a dermatologist.

What the spots look like

The AAD says marks left by acne on medium or darker skin are often brown, and can be bluish gray. Depth changes the color. A spot near the surface looks tan to dark brown. Color that lies deep in the skin is often slate blue to gray, or a deep brown.

Depth also changes the timeline. The AAD says a spot a few shades darker than your skin usually fades within 6 to 12 months once the cause stops, while deep color can take years. The page on how long dark marks take to fade explains why.

Visible light matters more on darker skin

Ultraviolet (UV) light darkens skin. Visible light, the ordinary light we see, does too.

A 2010 study in the Journal of Investigative Dermatology shone long-wave UVA light and visible light on the skin of 20 volunteers with darker skin types, IV to VI. Both caused pigment. The pigment from visible light was darker and lasted longer. The same light caused no pigment in the lighter skin type tested, type II.

The AAD applies this in its advice. Its sunscreen page says visible light can increase skin darkening, particularly in darker skin tones. Its dark spots page says iron oxide helps protect the skin from visible light, which it names as a cause of dark spots.

Choosing a sunscreen for dark spots

The AAD recommends a tinted sunscreen that contains iron oxide. Look for iron oxide in the inactive ingredients on the label. The AAD says tinted sunscreens add protection against visible light on top of the two types of UV rays. The AAD asks that the sunscreen also offer:

• SPF 30 or higher
• Broad-spectrum protection against both types of UV rays
• Water resistance
• A non-comedogenic formula, made so it does not clog pores, if your skin is oily
• A shade that blends with your skin tone, which avoids a white cast

Put it on every morning before going outside, on all skin that clothing will not cover. Reapply every two hours outdoors, and after swimming or sweating. The AAD also recommends a wide-brimmed hat.

Irritation can cause the spots you want to fade

On darker skin, irritation is itself a trigger. This creates a problem: a strong product used to fade spots can irritate the skin and make new ones. The 2010 review says treatment itself can cause or worsen these spots through irritation.

The AAD gives several warnings:

• Retinoids. Irritation from a retinoid can trigger dark marks on skin of color. Start slowly, every other night at first, and use moisturizer.
• Skin care products. A product that burns or stings should be stopped. Gentle products are often labeled "for sensitive skin" or "fragrance-free."
• Peels, microdermabrasion and lasers. On darkly pigmented skin, even at-home versions can cause permanent dark marks and light spots. See a dermatologist who often treats skin of color, and ask how many patients with skin of color they have treated.
• Heavy oils. The AAD says there is no scientific evidence that cocoa butter evens out skin tone, and it can cause acne.

Treat acne early

Acne is one of the most common triggers of dark spots on the face. The AAD says that for people with skin of color, acne often comes with dark spots that last much longer than the acne, and that you must treat the acne to stop the cause. It adds that if acne becomes moderate to severe before treatment starts, people with skin of color have a higher risk of dark patches and of keloids, a type of raised scar.

For mild acne on darker skin, the AAD recommends a retinoid with benzoyl peroxide. It calls the worry that benzoyl peroxide causes light spots a myth. It suggests a 2.5% benzoyl peroxide product to avoid irritation, used every other day if needed. Skinli's plan uses benzoyl peroxide 2.5% and adapalene 0.1%, the retinoid gel sold without a prescription. The complete acne skincare routine covers the steps.

Ingredients that fade spots, with the cautions

Ingredient	Evidence on darker skin	Caution
Tretinoin (prescription)	A 1993 trial in Black patients: 40% lightening of spots over 40 weeks, against 18% for a plain cream	Half the patients had irritation
Adapalene and tazarotene	The 2010 review says both have been shown to treat acne marks in darker skin safely	Start slowly
Azelaic acid	A 20% cream reduced spots more than a plain cream over 24 weeks in skin types IV to VI, per the 2010 review	The Azelex label says to watch for light spots on dark skin
Vitamin C	Studies mostly in melasma, in Latino and Asian patients	Unstable in light and air
Niacinamide	Not studied for these marks in darker skin, per the 2010 review	Not on the AAD list

The AAD's list of ingredients sold without a prescription is azelaic acid, glycolic acid, kojic acid, a retinoid and vitamin C. Add one at a time and patch test it first.

Melasma on darker skin

Not every patch comes from acne. Melasma causes brown or gray patches on both sides of the face, and the AAD says women with medium to dark skin tones are the most likely to get it. On darker skin it can look bluish gray.

Three points from the AAD matter most here. Visible light has been shown to worsen melasma, especially on darker skin, so a tinted sunscreen with iron oxide is part of treatment. Some melasma treatments can irritate darker skin, which can make melasma darker, and dermatologists know which precautions prevent this. And results usually take longer on a dark skin tone. The melasma page covers triggers and treatment in full.

A gentle routine for darker skin with dark spots

• Morning: gentle cleanser, light moisturizer, tinted sunscreen with iron oxide and SPF 30 or higher.
• Night: gentle cleanser, one active product such as an acne gel or a fading ingredient, then moisturizer.
• Weekly check: stop any product that stings, and look for new spots in places where you apply a new product.
• Monthly check: a photo in the same light, to judge fading honestly.

Products to avoid

The AAD warns that researchers have found steroids or mercury, not listed on the label, in skin care products imported from other countries. The steroids can make skin thin and fragile or permanently discolored. It suggests buying products made in the United States or recommended by a dermatologist, and it says never to put liquid bleach on your skin. MedlinePlus adds that in darker-skinned people, skin damage may cause permanent hyperpigmentation.

When to see a dermatologist

If home treatment does not give the results you want, the AAD says a dermatologist can help, and some spots need a prescription-strength treatment. It describes one patient whose dermatologist used laser therapy and prescription hydroquinone cream to even out his skin tone in 8 weeks.

Also watch for spots that look different. The AAD says that in people of African descent, melanoma tends to develop on the palm, the bottom of the foot, or under or around a nail. The National Cancer Institute says people with dark skin are less likely to get melanoma, but tend to be diagnosed at a more advanced stage. Read when a dark spot needs a doctor for the warning signs.