Hyperpigmentation Explained: PIH, Melasma and How to Treat Each
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Hyperpigmentation occurs when certain areas of skin become darker due to increased melanin production. It may appear as dark spots, patches, or an uneven skin tone and can result from acne, inflammation, injuries, hormonal changes, or sun exposure. Post-inflammatory hyperpigmentation often develops after acne or skin irritation, while melasma is commonly linked to hormonal changes and sun exposure. If you need help choosing suitable products, SHAY's skin consultation and quiz tools can provide personalized recommendations based on your skin type and concerns.
What Is Hyperpigmentation and Why It Happens
Hyperpigmentation develops when certain areas of the skin produce more melanin, making them appear darker than the surrounding skin.1 While usually harmless, it can leave behind uneven tone after acne, irritation, or other skin concerns.
- Sun exposure: UV radiation can increase melanin production and make existing dark spots more noticeable.
- Inflammation or injury: Acne, eczema, cuts, burns, and irritation may leave darker marks after the skin heals.
- Hormonal changes: Hormonal fluctuations can contribute to melasma, which often appears as darker patches on the cheeks, forehead, nose, and upper lip.
- Skin tone: Darker skin tones may be more prone to noticeable pigmentation after inflammation or injury.
- Skin care: Gentle products and consistent sun protection can help prevent pigmentation from becoming more noticeable.
Post-Inflammatory Hyperpigmentation vs Melasma: What's the Difference
Although both are forms of hyperpigmentation, PIH and melasma develop for different reasons and usually look different.
Post-inflammatory hyperpigmentation, or PIH, develops after acne, inflammation, or skin injury and appears as flat, darker marks. Melasma typically causes larger, symmetrical brown or gray-brown patches, often on the cheeks, forehead, nose, or upper lip. Hormones, sunlight, and visible light can contribute to melasma. PIH may gradually fade as inflammation settles, while melasma can be more persistent and require longer-term care. Since treatment differs, consult a dermatologist if you are unsure which type you have.
Hyperpigmentation Treatment Options for PIH
The right hyperpigmentation treatment for PIH should address both the dark marks and their underlying cause. If acne continues, new breakouts can create additional pigmentation, so avoid picking or squeezing pimples.
- Protect your skin: Use a broad-spectrum sunscreen with SPF 30 or higher to help prevent dark spots from becoming darker. Tinted sunscreen containing iron oxide may also help protect against visible light.
- Keep skincare gentle: Avoid harsh scrubs and products that cause burning or irritation, as inflammation can worsen pigmentation.
- Be patient: PIH often fades gradually. Dark spots may take 6 to 12 months to lighten, while deeper pigmentation can take longer. Consistent skincare and sun protection are essential.
Ingredients That Help Fade Acne Marks and Dark Spots
Certain ingredients can help improve dark spots over time. Niacinamide may support the skin barrier while improving uneven skin tone and pigmentation.2 Vitamin C offers antioxidant benefits and can help brighten the complexion. Other ingredients, including retinol, are also commonly used in hyperpigmentation treatment to improve the appearance of dark spots.
Cetaphil's acne and blemish range includes products intended for acne-prone, oily, combination, and sensitive skin. The range includes options such as Cetaphil Pro Oil Control Foam Wash, Cetaphil Gentle Exfoliating SA Cleanser, Cetaphil Gentle Exfoliating SA Lotion, Cetaphil Daily Advance Ultra Hydrating Lotion, and Cetaphil Bright Healthy Radiance. Treating active acne while maintaining the skin barrier can help address one of the underlying causes of PIH.
Do not introduce several active ingredients at the same time. Irritation can make pigmentation more difficult to manage. Start with a simple routine and give products enough time to work before deciding whether they are effective.
Treating Melasma: A Different Approach
Melasma often needs a more targeted approach because hormones, sunlight, and visible light can contribute to persistent pigmentation.
- Use a combination approach: There is no single best hyperpigmentation treatment for melasma. Treatment may include consistent sun protection, topical products, and, when appropriate, dermatologist-recommended procedures.
- Choose ingredients carefully: For sensitive skin, look for gentle brightening solutions with carefully selected ingredients that address pigmentation without unnecessarily disrupting the skin barrier. Cetaphil’s GentleBright Complex combines four thoughtfully chosen ingredients to help improve the appearance of dark spots and uneven skin tone while being suitable for sensitive skin.
- Personalize treatment: This is particularly important for darker skin tones, as excessive irritation can trigger additional pigmentation.
- Be patient: Melasma can take around 3 to 12 months to improve with treatment and may require ongoing maintenance because it can return.
Why Sun Protection Is Critical for Melasma Management?
Sun protection is essential for managing melasma because UV and visible light can increase pigmentation and make existing patches darker.
- Use SPF 30 or higher: Choose a broad-spectrum, water-resistant sunscreen and apply it consistently when outdoors.
- Reapply regularly: Reapply approximately every two hours and after swimming or sweating.
- Protect your skin: Wear a wide-brimmed hat, seek shade, and consider sun-protective clothing for additional protection.
- Consider tinted sunscreen: A tinted sunscreen containing iron oxide may provide added protection against visible light, especially for darker skin tones.
- Stay consistent: Sunscreen does not treat melasma on its own, but it can help prevent pigmentation from worsening and support other treatments.
Frequently Asked Questions About Hyperpigmentation, PIH and Melasma
What is the difference between hyperpigmentation, PIH and melasma?
Hyperpigmentation is the general term for darker areas of skin caused by increased or uneven melanin. Post-inflammatory hyperpigmentation develops after inflammation or injury, commonly following acne. Melasma typically appears as larger, symmetrical patches and is strongly associated with hormonal factors and light exposure.
Can post-inflammatory hyperpigmentation fade on its own?
Yes. Post-inflammatory hyperpigmentation can gradually fade after the original inflammation has healed. However, fading can take months, and deeper pigmentation may take much longer. Sun exposure can darken the marks, so consistent sun protection is important while they are fading.
What is the most effective hyperpigmentation treatment for melasma?
There is no single treatment that works best for everyone with melasma. Dermatologists often combine daily sun protection with topical treatments, and some people may benefit from procedures. The appropriate plan depends on factors such as skin tone, triggers, and the depth and severity of the pigmentation.
How long does it take to see results from a hyperpigmentation treatment?
Results depend on the cause and depth of pigmentation. AAD guidance notes that some dark spots may take 6 to 12 months to fade naturally, while treatment for melasma may take around 3 to 12 months to show results. Consistency and sun protection are important throughout treatment.
Does melasma come back after treatment?
Yes. Melasma can return even after it improves. Sun exposure is an important reason it may recur, which is why daily sun protection and ongoing maintenance are important. Hormonal triggers may also contribute to recurrence in some people.
Is sunscreen enough to prevent hyperpigmentation from worsening?
Sunscreen is essential, but it may not be enough by itself to treat existing pigmentation. Regular broad-spectrum SPF 30 or higher can help prevent dark spots from becoming darker and reduce the risk of new pigmentation. For melasma or persistent pigmentation, additional skincare or dermatologist-recommended treatment may be needed.