A healing bruise changes color in a predictable sequence, shifting from red to deep purple, then to green, yellow, and finally fading away entirely. The whole process typically takes about two weeks. Each color reflects a different stage of your body breaking down and clearing trapped blood beneath the skin.
The Color Stages of a Healing Bruise
When you first bump or knock into something hard enough to break tiny blood vessels under the skin, blood leaks into the surrounding tissue. Within the first few hours, the bruise appears pinkish or red. This is simply fresh blood pooling just beneath the surface.
Within hours to a day, the bruise darkens to a deep blue or purple. This happens because the hemoglobin in that trapped blood loses oxygen and changes color, much like how blood drawn into a vial looks darker than a fresh cut. Over the next several days, your body’s cleanup crew (a type of white blood cell) moves in and starts breaking hemoglobin down into component parts, each with its own distinct hue. The breakdown products shift the bruise through violet and into green, typically around days five through seven. After that, the green gives way to a dark yellow, then a pale yellow, and finally disappears completely.
The full sequence, as described by MedlinePlus: pinkish-red, dark blue or purple, violet, green, dark yellow, pale yellow, then gone. Not every bruise follows this timeline exactly. A small bump on your forearm might cycle through in 10 days, while a deep bruise on your thigh could take three weeks or more.
What Affects How Fast a Bruise Heals
Location matters. Bruises on your legs tend to heal more slowly than those on your arms or face, partly because gravity pulls fluid downward and blood flow in the lower body is slower. Deeper bruises also take longer because there’s more trapped blood for your body to process. You might notice a deep bruise doesn’t even become visible for a day or two, then seems to “spread” as blood migrates through tissue layers before the color changes begin.
Age plays a role too. As you get older, skin becomes thinner and the small blood vessels underneath become more fragile, which means bruises form more easily and can take longer to resolve. Certain medications speed up bruising or make it more dramatic. Aspirin and other blood thinners interfere with clotting, so more blood escapes into the tissue and bruises appear larger. Oral corticosteroids can also make skin and blood vessels more fragile. If you’re noticing bruises that seem out of proportion to the injury, or bruises appearing without any injury you can remember, nutritional deficiencies are worth considering. Vitamin C deficiency is the classic culprit, but low levels of zinc or B vitamins can also contribute.
How Bruises Look on Darker Skin Tones
The color progression described above is most visible on lighter skin. On darker skin tones, bruises can be difficult or even impossible to see with the naked eye because skin pigment sits closer to the surface than the bruise itself, effectively masking the color changes underneath. You might feel tenderness or slight swelling in an area without seeing the typical purple or green discoloration. Research published in the American Journal of Nursing found that specialized lighting techniques can detect bruises on darker skin up to five times more easily than standard room lighting, which highlights just how much standard descriptions of bruise appearance are skewed toward lighter skin.
If you have a darker complexion, paying attention to how an area feels (tenderness, warmth, slight firmness) is often more reliable than waiting for a visible color change.
What You Can Do to Help It Heal
There’s no way to make a bruise vanish overnight, but you can support the process. In the first 24 to 48 hours, applying something cold to the area helps slow blood flow to the injured vessels, which limits how much blood pools under the skin and can keep the bruise smaller. A bag of frozen peas wrapped in a cloth works fine. Apply it for 15 to 20 minutes at a time.
After the first couple of days, switching to warm compresses encourages your body’s metabolic processes to break down and carry away the damaged cells faster. This is the phase where you’re actively seeing the color shift from purple toward green and yellow, so warmth supports what your body is already doing. Elevating the bruised area when you can, especially if it’s on a limb, also helps reduce swelling and encourages drainage.
Signs a Bruise Needs Attention
Most bruises are harmless and follow the color timeline above without any intervention. But a bruise that keeps expanding over several days instead of gradually fading, or one that feels firm, hot, and increasingly painful, may have developed into a hematoma, which is a more significant collection of blood that can sometimes need medical drainage. The key differences: a normal bruise is flat or only slightly swollen and becomes less tender over time, while a hematoma often has noticeable swelling, redness, warmth, and pain that gets worse rather than better.
A bruise that hasn’t changed color at all after two weeks, or one that appears rock-hard, is worth having evaluated. The same goes for frequent unexplained bruising, especially if it’s showing up in places you haven’t injured, which can sometimes signal a clotting disorder or a medication side effect worth investigating.