Each color of a bruise reflects a specific stage of your body breaking down trapped blood beneath the skin. A typical bruise progresses from red to purple, then to green, yellow, and finally fades away over about two weeks. The rainbow of colors you see isn’t random. It’s a chemical process driven by the breakdown of hemoglobin, the oxygen-carrying protein inside red blood cells.
Why Bruises Change Color
When you take a hit, small blood vessels beneath the skin rupture and leak blood into the surrounding tissue. The red blood cells that escape eventually break apart, releasing hemoglobin. Your body then sends specialized cleanup cells to the area, and these cells begin dismantling the hemoglobin molecule piece by piece. Each stage of that breakdown produces a different pigment, and each pigment has its own distinct color. That’s why a bruise can look completely different from one day to the next.
The Color Timeline
A bruise starts as a pinkish or red mark within minutes of injury. This is simply fresh, oxygen-rich blood pooling under the skin. Within hours, the blood loses oxygen and the bruise deepens to a dark blue or purple. This is the stage most people think of as a “classic” bruise.
Over the next several days, the hemoglobin breaks down into a green pigment called biliverdin. This is the same process your liver uses to recycle old red blood cells every day, just happening locally in damaged tissue. The green tint may mix with the remaining purple, giving the bruise a muddy or brownish look during the transition.
Biliverdin is then converted into bilirubin, which produces a yellow or dark yellow color. This is the home stretch. The bruise lightens to a pale yellow before fading entirely. The iron left behind from the hemoglobin gets stored temporarily as hemosiderin, a brownish-yellow pigment. In most bruises, this clears on its own. The full cycle from impact to disappearance typically takes about two weeks.
What Each Color Tells You
- Red or pink: Very fresh, within the first few hours. Blood has just leaked from damaged vessels and still contains oxygen.
- Dark blue or purple: Hours to a couple of days old. The trapped blood has lost its oxygen and darkened.
- Violet or brownish-purple: A few days in. Hemoglobin is actively being broken down, and the color is transitioning.
- Green: Roughly 5 to 7 days. The green pigment biliverdin is now the dominant color in the area.
- Yellow or dark yellow: About 7 to 10 days. Biliverdin has been converted to bilirubin.
- Pale yellow or light brown: The final stage before the bruise disappears completely. Iron deposits are being cleared.
Bruise Colors on Darker Skin Tones
The color progression is the same biochemically, but it looks different depending on your skin tone. On darker skin, fresh bruises often appear purple, dark brown, or black rather than the bright red or blue that’s more visible on lighter skin. As healing progresses, the bruise may turn a lighter shade of brown, green, or yellow. Because the early stages can be harder to see, you may not notice a bruise until it’s already a day or two old.
Why You Can’t Date a Bruise by Color Alone
It’s tempting to look at a bruise and guess exactly when it happened, but even trained professionals can’t do this reliably. A forensic study found that experts estimating bruise age from photographs were off by a median of 26 hours, and extreme misjudgments occurred even with very fresh bruises photographed within the first 12 hours. Multiple colors can appear in a single bruise at the same time because different areas heal at different rates. Factors like the depth of the injury, your age, blood flow to the area, and whether you’re on medications that thin the blood all influence how quickly the colors shift.
Bone Bruises vs. Skin Bruises
Not all bruises are visible. A bone bruise happens when the impact is hard enough to damage the tissue inside a bone. The pain feels like a deep, throbbing ache coming from well below the skin surface, unlike the tenderness you feel when pressing on a regular bruise. Because the bleeding is so deep, you might not see any color changes on the surface at all, even though the same hemoglobin breakdown process is happening internally. Bone bruises also take significantly longer to heal than surface bruises.
Brown Stains That Linger
Sometimes a bruise fades through all its normal color stages but leaves behind a brownish or rusty discoloration. This is hemosiderin staining, caused by iron deposits left over from the breakdown of hemoglobin. In most cases, the stain gradually disappears as damaged tissues finish healing. But depending on the severity of the injury and your overall health, it can take weeks, months, or occasionally more than a year for the discoloration to fully clear. In rare cases, it becomes permanent. Areas with poor circulation, like the lower legs, are especially prone to lasting stains.
When a Bruise Isn’t Healing Normally
A bruise that doesn’t seem to progress through its usual color stages, or one that appears to stay the same for weeks, deserves attention. There are a few possible explanations. If you play contact sports or repeatedly bump the same area, you may be layering new injuries on top of old ones, resetting the clock each time. A blood clotting disorder can cause frequent or overlapping bruises that create the appearance of one bruise that never heals.
Frequent bruising without a clear cause is worth bringing up with a healthcare provider, especially if the bruises are large or appear in unusual locations. In rare cases, a dark spot that looks like a bruise but doesn’t change color or fade can be a sign of something else entirely, including certain types of skin cancer like melanoma. Any new dark spot on your skin that doesn’t follow the normal bruise progression is worth getting checked.
Speeding Up the Color Cycle
You can influence how quickly a bruise moves through its color stages with basic first aid. Applying ice in the first 24 to 48 hours constricts blood vessels and limits how much blood leaks into the tissue, which can make the bruise smaller and faster to resolve. After the first couple of days, switching to a warm compress increases blood flow to the area, helping your body’s cleanup cells clear the broken-down pigments more efficiently. Elevating the bruised area and avoiding further trauma to the spot also help keep things moving along. The two-week timeline is an average, and smaller bruises on well-circulated areas like the face often clear faster, while bruises on the legs can take longer.