What is the difference?
| Feature | Hyperpigmentation | Hypopigmentation |
|---|---|---|
| Pigment change | Extra melanin. | Reduced melanin. |
| Appearance | Darker spots or patches, including brown, black or gray. | Patches lighter than the surrounding skin. |
| Common examples | Marks after inflammation, melasma and sun spots. | Marks after inflammation, pityriasis alba, tinea versicolor and vitiligo. |
| Treatment approach | Address the cause and, where appropriate, reduce excess pigment. | Address the cause and allow or encourage pigment to return. |
| Expected course | Some marks persist for months or years. | Some recover over weeks to months; pigment loss from scars can be permanent. |
The prefixes mean more and less pigment, so the intimidating names contain a fairly small amount of information, despite arriving dressed for an academic conference. Depigmentation is a third term: it means absent pigment rather than reduced pigment. These changes can affect individual patches or wider areas of the body. A color change describes what you see, but does not identify the cause, which is where a color chart runs out of qualifications.15
Why does skin become darker or lighter?
Hyperpigmentation can follow sun exposure, acne, cuts or burns. Marks left after injury or inflammation are called postinflammatory hyperpigmentation. Melasma is another cause of dark patches, often associated with pregnancy or hormonal medications. Freckles and sun spots also involve increased pigment. Less commonly, wider darkening can be linked to conditions such as Addison's disease, which affects hormone production.134
Hypopigmentation can follow burns, blisters, infections or chemical exposure. Eczema and psoriasis can leave lighter areas after the inflammation settles. Pityriasis alba causes patches that can become lighter after their scale disappears. Tinea versicolor is a yeast related skin infection that can cause lighter or darker patches. Albinism is an inherited condition involving reduced pigment, rather than a mark acquired after a rash.124
People of any skin color can develop pigment changes. Light patches tend to stand out more against brown or black skin, while dark marks after inflammation are particularly common in darker skin types. Contrast alone does not tell you which condition caused a patch.46
Is every light patch vitiligo?
No. Vitiligo is one cause of pigment loss, not another name for every pale patch. It develops when there are not enough working melanocytes, the cells that produce melanin. The most common form involves the immune system destroying these cells. A patch can start pale and gradually turn white; hair in the affected area can also turn white or gray. Vitiligo is not an infection and cannot be caught from another person.7
What should you do first?
- 1Note when the color changed and whether a rash, injury, medication or procedure came before it. Bring the names of your medications and skin treatments to an appointment.
- 2Protect exposed skin from the sun every day. Use broad spectrum SPF 30 or higher, which protects against UVA and UVB rays, plus shade and clothing.
- 3For outdoor use, choose water resistant sunscreen. Reapply every two hours and after swimming or sweating.
- 4Watch light patches for a few weeks. Look for returning color, further lightening or new patches, rather than starting a treatment without knowing the cause.
Sunscreen matters for both changes, but for different reasons. UV exposure can darken excess melanin; exposed hyperpigmentation benefits from daily broad spectrum SPF 50 or higher. Areas with reduced pigment are more vulnerable to sun damage. Sunlight can also overstimulate pigment production while a light patch heals, turning it into a dark patch instead. Tanning is not a treatment for missing pigment.256
How is hyperpigmentation treated?
Treating the underlying acne or eczema can help dark marks recover. For excess pigment near the skin surface, options include hydroquinone, topical retinoids, azelaic acid, glycolic acid and vitamin C, alone or in combinations. These are options for particular diagnoses, not a shopping list to apply together. A clinician can choose the treatment that fits the cause; prescription combinations are used for some cases of melasma. Do not pick pimples, which can contribute to further marks.345
Chemical peels, lasers and dermabrasion can treat some dark patches, but they can also injure skin and produce more pigmentation. Cryotherapy, which freezes treated tissue, can cause permanent lighter areas. Darker skin has a greater risk of hypopigmentation after dermabrasion or peels targeting deeper skin layers. Discuss those risks before choosing a procedure to correct uneven color.25
How is hypopigmentation treated?
Light patches need treatment matched to their cause. Tinea versicolor can be treated with topical antifungals. Pigment changes after inflammatory conditions often improve once the underlying condition clears. Some conditions are treated with prescribed corticosteroids or calcineurin inhibitors, medicines that reduce immune related inflammation. Phototherapy uses controlled ultraviolet light and is another option for selected cases, including pigment loss after laser treatment. Microneedling remains uncertain because there is not enough research to establish how well it works for hypopigmentation.24
Vitiligo treatment depends on how much skin is affected and where the patches are. Options include prescribed creams and phototherapy. Steroid creams can restore some pigment, but prolonged use can thin skin and cause stretch marks. Treatment can restore color without making the change permanent, and response varies. There is no effective treatment to restore pigment lost through scarring or albinism.247
Makeup can camouflage either kind of color change, so the makeup bag has no use for the prefixes. Camouflage changes visibility rather than treating the underlying cause, and can be useful while color recovers or when pigment loss is permanent.25
How long does pigment take to return to normal?
Dark marks after inflammation can last months or years, and treatment works slowly. Lighter marks after inflammation or infection often recover over weeks to months once the cause has cleared. A light patch after a brief rash can begin darkening within a few weeks; a long lasting rash can leave a slower or incomplete recovery. Scar related pigment loss is permanent, and vitiligo patches are usually permanent without successful treatment.4567
When should you see a dermatologist?
Book an appointment for new or worsening light patches, or light patches that show no change after a few weeks. Seek care for discolored skin that is painful, itchy, hot, red or leaking blood or pus. Not every dark patch is harmless pigmentation: examination and sometimes a skin biopsy are needed to rule out other causes, including skin cancer. Pigment changes causing significant distress also deserve care.2346
A clinician will examine the patches and ask about their onset, previous inflammation and medications. A Wood lamp, a special ultraviolet light, can make pigment changes easier to assess and help distinguish vitiligo from other causes. Tests depend on the findings; some people need blood tests or a small skin sample rather than another skincare product.37
Where this answer comes from
- 1Skin Pigmentation Disordersmedlineplus.gov
- 2Hypopigmentation: What It Is, Causes & Treatmentmy.clevelandclinic.org
- 3Hyperpigmentation: What it is, Causes, & Treatmentmy.clevelandclinic.org
- 4Pigmentation Disorders: Diagnosis and Managementaafp.org
- 5Pigmentation disordersdermnetnz.org
- 6Treating light spots in brown or black skinaad.org
- 7Vitiligonhs.uk
