Each color of a bruise reflects a specific stage of your body breaking down trapped blood beneath the skin. A fresh bruise starts red or purple, shifts to blue, then green, then yellow, and finally fades to light brown before disappearing. Most bruises heal completely within about two weeks, though some can take months to fully resolve.
Why Bruises Change Color
When you bump into something hard enough to damage small blood vessels under your skin, blood leaks out and pools in the surrounding tissue. Since there’s no open wound for the blood to escape through, your body has to dismantle it in place. White blood cells called macrophages arrive and start breaking down the hemoglobin from ruptured red blood cells, producing a series of pigments that each reflect light differently. That’s why a bruise cycles through distinct colors rather than simply fading from dark to light.
The breakdown follows a specific chemical sequence. Hemoglobin splits into heme and a protein component. Heme gets converted into a green pigment, which then gets converted into a yellow pigment. The leftover iron from hemoglobin gets stored as a brownish protein. Each of these byproducts dominates at a different point in healing, creating the color progression you see on your skin.
Red or Pink: Day One
A brand-new bruise looks red or pinkish because you’re seeing fresh, oxygen-rich blood that has just leaked out of damaged vessels. At this point, hemoglobin is still intact and hasn’t started breaking down yet. This stage is usually brief, often lasting less than a day before the bruise darkens.
Blue, Purple, or Dark Red: Days 1 to 4
Within hours to a day, the pooled blood loses oxygen and the hemoglobin changes structure, shifting the bruise to deep blue, purple, or dark red. This is typically the most dramatic-looking stage, and often the most tender. The bruise may also swell slightly as fluid accumulates around the injured area. On lighter skin, these dark colors are unmistakable. On darker skin tones, this stage can be much harder to spot because skin pigment sits closer to the surface than the bruise itself, partially masking the discoloration underneath.
Green: Days 5 to 7
The green tint signals that your body’s cleanup crew is actively at work. Macrophages are converting heme into its first byproduct, a green pigment called biliverdin. You may notice green appearing at the edges of the bruise first while the center still looks blue or purple. This is normal. Healing progresses from the outside in because the thinner layer of leaked blood at the margins gets processed faster.
Yellow or Brown: Days 7 to 14
As biliverdin is further converted into bilirubin, the bruise shifts to yellow or dark yellow. Meanwhile, iron released from hemoglobin gets stored as hemosiderin, a protein with a rusty, brownish-yellow appearance. You may see patches of yellow and brown at the same time, especially in a larger bruise where different areas are healing at slightly different rates. This is the final visible stage before the bruise fades completely. In most cases, hemosiderin left behind by an injury gradually disappears as the tissue finishes healing, though areas of staining can occasionally darken to deep brown before resolving.
How Bruises Look on Darker Skin
The classic red-to-purple-to-green-to-yellow progression is most visible on lighter skin. On darker skin tones, bruises can be difficult or even impossible to detect with the naked eye, particularly in the early stages. Research published in the American Journal of Nursing found that using specific light wavelengths (violet and blue light with yellow-tinted goggles) can detect bruises on darker skin up to five times more easily than standard white examination light. If you have a darker complexion, you may notice a bruise more by feel (tenderness, slight swelling, warmth) than by color changes. The yellow and brown stages tend to be somewhat more visible than the initial blue or purple phase.
Bruises vs. Hematomas
A standard bruise is a flat discoloration caused by blood leaking from small, shallow vessels. A hematoma involves larger blood vessels and creates a pool of blood that forms a raised, firm lump under the skin. Hematomas tend to be more painful, take longer to resolve, and sometimes need medical drainage. If your bruise feels like a hard knot rather than a flat mark, that’s the key distinction.
What Slows Down Healing
While most bruises clear up in about two weeks, several factors can stretch that timeline considerably. Age is one of the biggest. Older adults often develop painless bruises on their forearms from years of sun exposure thinning the skin. These bruises form easily and heal slowly.
Medications are another common factor. Blood thinners, aspirin, ibuprofen, certain antidepressants, steroid medications, and even herbal supplements like ginkgo and ginseng can all make you bruise more easily and heal more slowly. If you recently started a new medication and notice more frequent or larger bruises, that connection is worth paying attention to.
What you do in the first 48 hours also matters. Applying ice shortly after the injury can reduce swelling and may help the bruise heal slightly faster. Heat does the opposite: hot baths, heating pads, and saunas in the first two days can widen blood vessels and make the bruise spread.
When Bruise Color Should Concern You
A bruise that follows the normal color progression and fades within a few weeks is almost always harmless. But certain patterns warrant attention. Large bruises that appear on your torso, back, or face without a clear cause can signal a bleeding disorder or other underlying condition. The same applies if you bruise easily and also bleed heavily from minor cuts, or if a family member has a similar pattern.
A bruise that doesn’t change color at all, keeps growing after the first day or two, or remains firm and raised for weeks may be a hematoma that isn’t resolving on its own. And a bruise that stays dark brown or black long after it should have faded could indicate hemosiderin staining that, while usually harmless, sometimes points to problems with blood flow in the veins rather than a simple injury.