The spot cleared weeks ago and the mark is still there. Here is what that mark actually is, how long it takes to go, and what shortens the timeline.
What post-inflammatory hyperpigmentation is
Post-inflammatory hyperpigmentation, usually shortened to PIH, is a flat dark mark left behind after skin inflammation resolves. Acne is the most common cause, but it follows any inflammation: cuts, burns, insect bites, eczema flares, or an aggressive cosmetic treatment.
The mechanism is straightforward. Inflammation stimulates melanocytes to produce excess pigment, and that pigment is deposited in the skin. Once the original spot heals, the pigment stays behind until normal cell turnover carries it out.
PIH is not a scar
This distinction changes everything about what to expect.
PIH is flat. Run a finger over it and the surface is level with the surrounding skin. It is a colour problem, and colour fades.
A scar has texture. Indented pitting or raised tissue means collagen was damaged or overproduced. That is a structural problem, and it does not fade on its own.
If your marks are flat, time is genuinely on your side. If they are indented, no topical product or supplement will fill them, and the honest answer is that professional treatments such as microneedling, resurfacing or fillers are the only meaningful options.
If your marks are symmetrical patches on the cheeks and forehead that did not follow a spot, you may be dealing with melasma rather than PIH, and the approach differs.
How long it takes
Left alone with good sun protection, PIH typically fades over three to twenty four months. The range is wide because it depends on how deep the pigment sits, your natural skin tone, and how much sun the area gets.
Deeper pigment takes longer. Marks that look grey or blue-grey rather than brown tend to sit deeper and resolve more slowly than surface brown marks.
What speeds it up
Daily sunscreen. This is the highest-impact action and the one most often skipped. UV exposure re-stimulates the same melanocytes that created the mark, actively extending the timeline. Sunscreen on its own can be the difference between four months and eighteen.
Gentle, regular exfoliation. Encouraging cell turnover moves pigmented cells toward the surface faster. Mild chemical exfoliation is generally better tolerated than physical scrubbing, which risks causing the very inflammation that created the problem.
Niacinamide. Interferes with the transfer of pigment into skin cells and is well tolerated by most people.
Vitamin C. Antioxidant support plus a modest direct effect on pigment production.
Azelaic acid. One of the better-evidenced options for PIH specifically, and usually tolerable on acne-prone skin.
Treating the underlying cause. If new spots keep appearing, you are creating new marks faster than the old ones fade. Getting the acne itself under control is the prerequisite for making progress on the marks.
What makes it worse
- Picking and squeezing. This is the big one. Every squeeze adds inflammation, which adds pigment, and often converts what would have been a flat mark into a textural scar.
- Sun exposure without protection. Actively resupplies the problem.
- Harsh scrubs. Physical abrasion on inflamed skin is counterproductive.
- Too many actives at once. Irritation from an overloaded routine causes inflammation, and inflammation is what caused the marks in the first place.
Where exfoliating products fit
A structured exfoliating routine has a genuine role here, because turnover is the mechanism by which pigment clears. That is the logic behind the Brilliant 3-step exfoliating facial set and the graduated soap sequence: start mild, let the skin adapt, increase gradually.
If you are starting from scratch on body or face cleansing, work through the soaps in order rather than jumping to the strongest. Soap 01 is the entry point, Soap 02 adds oatmeal exfoliation once skin has adjusted, and Soap 03 is the strongest of the three and is meant for skin already conditioned by the first two. All three are in the soap collection.
The failure mode is going too hard too fast. Acne-prone skin that has just finished a breakout is already compromised, and aggressive exfoliation on top of it produces more inflammation and therefore more pigment. If your skin stings, tightens or flakes, you have overshot and are working against yourself.
Where oral supplements fit
Antioxidant supplements including glutathione may play a supporting role in overall pigmentation, but PIH is fundamentally a turnover-and-time problem. Sunscreen and consistency will do more for it than any capsule, and it would be dishonest to suggest otherwise. If you want to add one alongside a topical routine, Ultima is the formula weighted toward skin tone.
A realistic plan
- Daily: broad-spectrum SPF, every morning, without exception
- Daily: a gentle cleanser and a niacinamide or vitamin C product
- Two or three times a week: mild exfoliation, increasing only if tolerated
- Ongoing: whatever is keeping the acne itself under control
- Never: picking
- Monthly: a photograph in the same light, since this fades too slowly to perceive day to day
When to see a professional
See a dermatologist if the marks are indented or raised rather than flat, if new acne keeps appearing despite treatment, or if flat marks have not moved at all after six months of consistent sun protection. Prescription options and in-clinic treatments exist and work faster, and the assessment is worth having before you spend another year on products.