The pimple goes. The mark it left behind does not.
That mark has a name: post-inflammatory hyperpigmentation, or PIH. It is not a scar. Your skin responded to inflammation by making extra pigment, and that pigment is still sitting there.
The good news is that PIH fades. The bad news is the timeline nobody wants to hear.
Why it is worse on deeper skin
More melanin means a more visible response to the same inflammation. PIH is more common, more obvious, and slower to clear on brown and black skin.
This is not a flaw. It is the same pigment that protects you, doing what it does.
Most international skincare content quietly assumes pale skin. It is one reason advice that works for a reviewer in London may do very little for you.
Stop picking
Every squeeze extends the inflammation, and the inflammation is what made the pigment.
A spot left alone might mark for six weeks. The same spot picked might mark for six months.
The two things that reliably work
Sunscreen, every morning. Ultraviolet drives pigment production directly. Without it you are lifting marks and putting them straight back. This is not optional; it is most of the answer.
A brightening active, nightly. Alpha-arbutin is the gentler route. It interrupts pigment production without the irritation that harsher options bring, and irritation is what caused the mark in the first place.
Niacinamide alongside it helps in a different way, by calming the skin and slowing pigment reaching the surface.
How long, honestly
Three months to see a difference. Six to a year for older marks.
Anything advertising two weeks is selling you a brightening filter, not a result. If a product lightens your skin quickly, be suspicious rather than pleased.
When to see a doctor instead
If the patches are symmetrical across your cheeks, forehead or upper lip, that may be melasma, not PIH. It behaves differently and often needs prescription treatment.
If a mark is raised, growing, changing colour, or bleeding, see a doctor. That is not a skincare question.