Most bruises fade on their own within two to three weeks. Along the way they cycle through a predictable set of colors — red, purple-blue, green, then yellow-brown — as your body breaks down and reabsorbs the blood trapped under the skin. Cold in the first 48 hours and gentle warmth afterward remain the most reliable ways to help the process along.
That’s the short version. Below is what’s actually happening under the skin day by day, what’s worth doing at each stage, and the handful of situations where a bruise deserves a doctor’s opinion instead of patience.
First, what a bruise actually is
A bruise — the medical term is contusion — forms when an impact breaks the tiny capillaries beneath your skin. The blood has nowhere to go, so it pools in the surrounding tissue and shows through as that familiar dark mark. There’s nothing to clean and nothing to bandage. Caring for a bruise really comes down to two things: limiting how much blood leaks out in the first day or two, and then helping your circulation clear the debris. Almost every piece of good advice below is one of those two jobs.
The color timeline: what’s normal
Bruises heal from the inside out, and the changing color is literally the breakdown chemistry showing through your skin.
- Days 1–2 — red to purple-blue. Fresh blood is bright red; as it loses oxygen it darkens. Tenderness and a little swelling peak around here.
- Days 2–5 — blue to deep purple, sometimes nearly black. This is the low point. A bruise often looks its worst around day three or four — that doesn’t mean it’s getting worse.
- Days 5–7 — green. Hemoglobin, the red pigment in blood, is being broken down into biliverdin, which is green.
- Days 7–10 — yellow to brown. Biliverdin becomes bilirubin, which is yellow. The end is near.
- Days 10–14 and beyond — faded brown, then gone.
Two things worth knowing about the schedule. First, location matters more than the size of the knock: a bruise on your face, where blood supply is rich, often clears in about a week, while the same impact on a shin can take three or four — circulation down there is slower and gravity doesn’t help. Second, the sequence matters more than the speed. A bruise that keeps moving through the colors is doing its job, even if it’s slow about it. One that stays dark, keeps growing, or hurts more after day three is the exception — see the last section.
The first 48 hours: cold, elevation, and restraint
The goal early on is simple: less leaking. Cold narrows the broken vessels, which means a smaller, lighter bruise later.
- Ice it, briefly and often. Ten to fifteen minutes at a time, a few times a day, always with a towel between ice and skin. A bag of frozen peas works better than ice cubes — it molds itself to a shin or a cheekbone.
- Elevate if you can. If the bruise is on an arm or leg, propping it above heart level for a while slows blood flow into the area. A pillow under the ankle while you watch TV counts.
- Skip the heat — and maybe the wine. Hot baths, saunas, and alcohol all widen blood vessels. On day one, that means more leaking, not more healing.
- Don’t knead it. Massaging a fresh bruise “to break it up” does the opposite — you can rupture more capillaries and end up with a bigger mark.
After 48 hours: switch sides
Once the leak has sealed — usually about two days in — the job flips from limiting blood flow to encouraging it. Circulation is what carries the debris away.
A warm compress for ten to fifteen minutes, two or three times a day, is enough. Gentle movement helps too: if the bruise is on a leg, ordinary walking is genuinely useful. If you massage, keep it light and work around the edges rather than grinding into the middle — think encouraging traffic, not demolition.
Where arnica fits in
Arnica montana, a yellow mountain flower, has been rubbed on bumps and bruises in European folk practice for centuries. Today it mostly comes as a cream or gel, and it belongs to exactly this second stage — the massage-and-circulation phase after the first day or two. (Cream versus gel is mostly texture preference: creams are richer, gels feel cooler going on.)
The honest answer on evidence, since it’s the question everyone asks: research is mixed. Some small clinical studies found arnica creams modestly improved how quickly bruises faded; others found no meaningful difference. What a cream reliably gives you is a routine — a reason to gently massage the area a few times a day, which supports circulation on its own — plus skin that feels less dry and tight while it recovers.
If you’d like one in the cabinet, our Arnica Bruise Cream is made with Arnica montana extract for exactly this use: a thin layer over the bruise, massaged in gently, two to three times a day from day two or three onward. Two ground rules with any arnica product: keep it off broken skin, and stop if the area turns red or itchy — some people are sensitive to the plant.
Bruises on your face
Facial bruises earn their own note, partly because they’re the ones people most want gone. The good news: the face heals fast. Its rich blood supply usually clears a bruise in five to ten days — roughly half the time the same knock would take on a leg.
A few face-specific adjustments:
- Go gentler with cold. Ten minutes with a cloth barrier is plenty for a cheek or brow.
- Sleep slightly propped up for the first night or two. It noticeably limits morning swelling.
- Makeup is fine once the skin is intact. A yellow-toned concealer neutralizes purple far better than a skin-toned one.
- Be more careful around the eye. A black eye that comes with any change in vision, a worsening headache, or a serious impact belongs in the doctor’s-visit list below — not the wait-it-out list.
Why some people bruise at the slightest tap
If you bruise easily, you’re not imagining it — and it’s usually not sinister. Skin thins with age and its capillaries get more fragile, which is why forearm bruises become common in older adults. Years of sun exposure make that worse. Blood-thinning medications make bruising easier, and so do some everyday supplements — fish oil, ginkgo, and high-dose vitamin E among them. A diet very low in vitamin C or K can contribute, though that’s uncommon.
If easy bruising is new for you and nothing about your medications or activity has changed, it’s worth mentioning at your next appointment.
When a bruise deserves a doctor
Almost every bruise is a wait-it-out situation. These are the exceptions:
- Still dark and solid after two weeks, or not gone after four
- Bruises keep appearing with no impact you can remember
- It keeps spreading, or hurts more after day three instead of less
- A firm, growing lump under the surface
- Bruising alongside frequent nosebleeds or bleeding gums
- You take a blood thinner and the impact was significant
- Near the eye with any vision change — or it followed a blow to the head
None of these mean something is definitely wrong. They’re simply the situations where “give it time” stops being the right default.
Quick answers
Ice or heat for a bruise? Both, in that order: cold for the first 48 hours, warmth after that. The one real mistake is heat on day one.
How often should you apply arnica cream? Typical use is a thin layer on intact skin, two to three times a day. Don’t expect overnight change — in the studies where arnica made a difference at all, it showed up over days, as the bruise moved through its normal color stages.
Why is my bruise turning yellow? That’s the finish line, not a problem. Yellow is bilirubin, the last breakdown product before the mark disappears entirely.
This article is general educational information about routine bruise care. It isn’t medical advice, and it’s no substitute for a clinician who can actually look at your situation. If a bruise fits anything in the list above — or you’re simply unsure — get it checked.