Have you ever used a Vitamin C serum for two months and seen absolutely nothing change? Or tried niacinamide, then alpha arbutin, then glutathione, and felt like your skin was ignoring all of it? You're not doing anything wrong. The problem is that "dark spots" isn't one thing. It's four distinct skin concerns — PIH, PIE, sun tan, and melasma — each with a different cause and each needing a different fix.
This guide breaks down exactly what's behind the dark marks on your skin and which ingredients are actually built to address each one.
What is hyperpigmentation?
Hyperpigmentation is when certain areas of the skin become darker than the surrounding skin. The cause is excess melanin, the pigment responsible for your skin's colour. When skin is injured, inflamed, or exposed to UV radiation, melanin production can go into overdrive, leaving behind darker patches.
Here's the catch: not all dark marks are caused by excess melanin. Some have a completely different origin. That's exactly why the wrong ingredient won't give you results, no matter how diligently you use it.
What are the four types of dark marks and how do you tell them apart?
Post-inflammatory hyperpigmentation (PIH): the brown marks left by acne
PIH is the most common dark mark concern in Indian skin. It shows up as flat, brown or dark brown marks right where a pimple, rash, or skin injury used to be. It's not the active acne. It's what the inflammation leaves behind after it settles.
Indian skin, which typically falls in the medium-to-deep tone range, produces more melanin as part of its healing response. This is why post-acne marks tend to be darker and take longer to fade for people with deeper skin tones.
What targets PIH: Niacinamide, Vitamin C, alpha arbutin, kojic acid, and azelaic acid all work on melanin pathways. Daily SPF is essential here. Without sun protection, PIH darkens with every UV exposure and your actives have to work twice as hard.
Post-inflammatory erythema (PIE): the pink or red marks
PIE is the one most people misidentify as PIH. It appears as pink, red, or purplish marks, again exactly where acne used to be. But the cause is different. PIE comes from damaged capillaries under the skin surface that become dilated and visible after inflammation. It has nothing to do with melanin.
This is one of the most common reasons people feel their serums "aren't working." They're using melanin-targeting ingredients on a vascular concern.
What helps PIE: Consistent broad-spectrum SPF is the most important step. UV exposure worsens vascular damage. Avoiding picking or squeezing, being gentle with skin, and giving it time are the main approaches. PIE fades more slowly than PIH and is largely a waiting game with good barrier support underneath.
Sun tan: UV-triggered melanin production
A tan is a specific, UV-driven form of hyperpigmentation. When skin is exposed to UVA and UVB rays without adequate protection, it produces additional melanin as a defensive response. The result is a darkening of existing skin tone, often uneven, covering larger areas, most visible on exposed zones like the face, neck, and arms. Unlike PIH, sun tan doesn't follow individual spots or marks. It tends to show as an overall darkened complexion or patchwork darkening across sun-exposed areas.
What helps with tan: Consistent, generous SPF is both treatment and prevention. AHAs like glycolic acid help exfoliate melanin-containing surface cells over time. Vitamin C neutralises free radicals from UV exposure and supports a more even skin tone.
Melasma: larger patches, hormonal roots
Melasma appears as larger, blotchy patches, commonly on the forehead, cheeks, and upper lip. Unlike PIH, it's triggered by hormonal changes (such as during pregnancy or with certain medications) combined with UV exposure. It affects the deeper dermal layer of skin, which makes it more resistant to topical ingredients.
Melasma looks similar to PIH but is symmetrical, appears in larger patches, and doesn't follow individual spots. Over-the-counter ingredients can help manage it, but significant melasma often warrants a dermatologist visit.
Important: If you suspect melasma, a dermatologist can assess options like chemical peels, laser therapy, or prescription actives. These go beyond what topical skincare alone can reach.
How do you tell which dark mark you have?
| Concern | Colour | Shape | Cause | Key differentiator |
|---|---|---|---|---|
| PIH | Brown / dark brown | Small spots matching old breakouts | Excess melanin post-inflammation | Follows acne location exactly |
| PIE | Pink / red / purple | Small marks where acne was | Damaged blood vessels | Colour is pink or red, not brown |
| Sun tan | Beige to dark brown | Larger, diffuse areas | UV exposure | Covers whole sun-exposed zones |
| Melasma | Brown / greyish-brown | Large symmetrical patches | Hormonal + UV | Symmetrical; often on forehead, cheeks |
Which ingredients work for each type of dark mark?
For PIH: melanin-targeting actives + SPF
Niacinamide works by interfering with the transfer of melanin to the skin's surface cells. It's one of the gentlest brightening ingredients available, well-tolerated by all skin types including sensitive and acne-prone. Its dual action on melanin and inflammation makes it especially useful for PIH.
Vitamin C (specifically 3-O-Ethyl Ascorbic Acid in Pilgrim's serum) works through a different mechanism. It blocks the enzyme that initiates melanin production in the first place. This makes it complementary to niacinamide rather than redundant.
SPF is the baseline. Every time melanin-marked skin is exposed to UV rays without protection, PIH deepens and slows everything else down. Daily, broad-spectrum SPF 50 is the foundation of any PIH routine.
For PIE: SPF, barrier support, and time
PIE responds best to consistent SPF, a gentle approach to skin (no picking, no harsh scrubbing), and a well-functioning skin barrier. Niacinamide helps here too — not as a melanin ingredient, but as an anti-inflammatory that supports barrier function and reduces irritation-driven redness.
For sun tan: SPF + exfoliation + Vitamin C
SPF prevents further deepening. AHAs help exfoliate surface cells that carry melanin. Vitamin C supports a brighter, more even complexion over time. These three work well together for tan-prone skin, each handling a different part of the same problem.
For melasma: combination approach + dermatologist guidance
Vitamin C, niacinamide, and alpha arbutin can provide some topical improvement. But melasma's hormonal triggers and deeper skin penetration mean OTC-only approaches often plateau. Consistent SPF remains the single most important daily step. For tougher cases, a dermatologist can advise on stronger options.
How do you build a routine to target dark spots and pigmentation?
A straightforward routine for PIH and sun tan, the two most common concerns in Indian skin:
Morning:
- Gentle cleanser
- 10% Vitamin C Face Serum (3 to 5 drops on cleansed face and neck, patted in gently)
- Lightweight moisturiser
- Broad-spectrum SPF 50+ (apply generously; reapply every 2 hours in direct sun)
Evening:
- Gentle cleanser
- Niacinamide serum (targets melanin transfer, reduces inflammation, supports barrier)
- Moisturiser
When using Vitamin C in the morning, always follow with a broad-spectrum sunscreen. Vitamin C supports UV protection but does not replace it.
Why isn't your dark spot serum working?
If you've been at this for months and feel stuck, it's usually one of three things.
You're targeting the wrong concern. Pink or red PIE marks won't respond to melanin-targeting serums. Brown PIH marks won't respond to SPF alone. Identify first, then treat.
SPF is missing or inconsistent. No brightening ingredient can compete with daily UV exposure. Even indoor light and brief outdoor moments — commuting, sitting by a window — can deepen PIH. SPF is the baseline without which everything else moves slowly.
Expectations and consistency. While high-quality, stable brightening actives can start visibly reducing the appearance of dark spots in just a few days, completely clearing deeper marks requires an ongoing commitment. Stick to your routine and your daily SPF rather than constantly switching products.
Final thoughts
The most useful thing you can do for dark spots is correctly identify what you're actually dealing with. Brown marks from acne are PIH. Pink or red marks are PIE. Diffuse darkening from sun is a tan. Large symmetrical patches suggest melasma. Each has a different treatment path, and using the right ingredient for the right concern is the whole game.
Vitamin C and niacinamide are the most evidence-supported options for PIH and tan. SPF is the foundation. Without it, even well-chosen serums move slowly. For persistent concerns like melasma, a dermatologist visit is worth the trip. Be consistent, give it time, and build on the right base.
Frequently asked questions
What is the difference between PIH and PIE?
PIH appears as brown or dark marks caused by excess melanin after inflammation, typically after acne. PIE appears as pink or red marks caused by damaged blood vessels under the skin surface. The colour is the clearest tell: brown marks are usually PIH; pink or red marks are usually PIE. They respond to different treatments, which is why telling them apart matters.
Which serum is best for post-acne dark marks?
For brown, melanin-based post-acne marks (PIH), serums with Vitamin C, niacinamide, or alpha arbutin are most commonly recommended. Daily SPF 50+ is essential alongside any brightening serum. Without sun protection, PIH darkens with UV exposure and the serum's progress slows significantly.
Why isn't my dark spot serum working?
The most common reasons are targeting the wrong concern (using melanin serums on vascular PIE marks) or inconsistent SPF use. No matter how fast-acting your brightening serum is, UV exposure will actively darken the spots you are trying to fade. Ensure you are applying a broad-spectrum SPF 50 daily to protect your progress.
Can niacinamide and Vitamin C both be used for dark spots?
Yes, and they work well together. Niacinamide interferes with melanin transfer; Vitamin C blocks melanin production upstream. Using both alongside daily SPF gives you a broader approach to PIH than either ingredient alone. Apply Vitamin C first in the morning, then niacinamide after it absorbs.
How long does it take for dark spots to fade?
With the right active ingredients, you can start seeing visible brightening and a reduction in dark spots within the first few days of use. However, for older or deeper marks, sun tan, or melasma, continued daily use alongside broad-spectrum SPF 50+ is essential to achieve a completely clear, even complexion.
Does sunscreen really make a difference for dark spots and hyperpigmentation?
Yes, and meaningfully so. UV exposure triggers more melanin production, which directly deepens PIH and worsens tanning. UVA rays (which make up 95% of UV radiation and penetrate glass) can affect pigmentation even on cloudy days and indoors near windows. SPF 50 is the minimum for anyone targeting dark spots.
Is Vitamin C safe for sensitive skin?
Pilgrim's 10% Vitamin C serum is clinically tested for sensitive skin, with 100% of users in a consumer study reporting no burning or itching sensation.* As with any new active, a patch test before full application is sensible. Starting with alternate-day use before moving to daily is a reasonable approach for sensitive skin.
Can I use a Vitamin C serum at night?
Yes. If used in the morning, always follow with sunscreen. Evening use removes the same-day SPF pairing requirement while still delivering the brightening and antioxidant benefits of the ingredient.
