A sprained ankle typically looks swollen, puffy, and often bruised, with the severity of these visual changes depending on how badly the ligament is damaged. A mild sprain may show only slight puffiness around the outer ankle bone, while a severe sprain can make the entire ankle and foot balloon with deep purple bruising that spreads down to the toes. Here’s what to look for and what each sign tells you.
Swelling: The First and Most Obvious Sign
Swelling is almost always the first thing you’ll notice. It usually starts within minutes of the injury and centers around the bony bump on the outside of your ankle. In a mild sprain, this might look like a soft, slightly puffy area that makes one ankle noticeably larger than the other. In moderate and severe sprains, the swelling spreads across the top of the foot, around both sides of the ankle, and sometimes up the lower leg. The skin may look stretched and shiny.
You can get a rough sense of how significant the swelling is by gently pressing a finger into the puffy area for about five seconds. If the skin bounces back immediately and the dent is barely visible, the swelling is mild. If your finger leaves a deeper pit that takes 15 seconds or longer to fill back in, the swelling is more severe. Comparing both ankles side by side is the easiest way to see the difference.
The injured area also tends to feel warm to the touch. That warmth comes from increased blood flow as your body rushes inflammatory cells to the damaged tissue. If the skin looks red and feels hot, that’s consistent with a fresh sprain, though it can also signal infection in a wound, so context matters.
Bruising: When It Appears and What It Looks Like
Bruising doesn’t always show up right away. Moderate and severe sprains tear small blood vessels around the ligament, but the leaked blood can take several days to become visible at the skin’s surface. You might injure your ankle on Monday and not see discoloration until Wednesday or Thursday.
The bruising typically starts as a dark blue or purple patch around the outer ankle bone, then spreads downward with gravity. It’s common to see bruising along the side of the foot, under the arch, and even around the toes days after the injury, even though those areas weren’t directly hurt. Over the following one to two weeks, the bruise shifts through the familiar color sequence: dark purple to green, then yellow and brown as your body reabsorbs the blood. Most bruising clears within about two weeks.
A mild (Grade 1) sprain often produces no bruising at all. If you see significant discoloration, the injury is likely at least a moderate sprain.
How Mild, Moderate, and Severe Sprains Compare
Ankle sprains are graded on a three-point scale based on how much of the ligament is torn, and each grade looks noticeably different.
- Grade 1 (mild): The ligament is stretched but not torn. You’ll see slight swelling and stiffness around the outer ankle, but little to no bruising. The ankle still feels stable, and you can usually walk on it with minor discomfort.
- Grade 2 (moderate): The ligament is partially torn. Swelling is more pronounced, bruising develops over the following days, and the area is tender to touch. Walking is painful, and the ankle may feel somewhat wobbly or loose.
- Grade 3 (severe): The ligament is completely torn. The ankle swells rapidly and significantly, often with immediate and extensive bruising. The joint feels unstable, and walking is usually not possible because the ankle gives out under your weight.
If you’re looking at your ankle and trying to gauge the severity, the two biggest visual clues are the amount of swelling and whether bruising appears. A Grade 3 sprain is often obvious: the ankle looks dramatically different from normal, and putting weight on it feels impossible.
High Ankle Sprains Look Different
Most ankle sprains injure the ligaments on the outside of the ankle, but a less common type called a high ankle sprain affects the ligament connecting the two lower leg bones just above the ankle joint. The visual difference is the location: instead of swelling concentrated around the outer ankle bone, a high ankle sprain produces swelling and tenderness higher up on the front and outer part of the lower leg, sometimes with tenderness on the inner side of the ankle as well. The bruising pattern tends to be less dramatic than a typical lateral sprain, which can be misleading because high ankle sprains are often more serious and slower to heal.
Sprain vs. Fracture: What You Can’t Tell by Looking
A sprained ankle and a broken ankle can look nearly identical from the outside. Both cause swelling, bruising, and pain. There’s no reliable way to tell them apart just by appearance. One common misconception is that if you can walk on it, it’s not broken. That’s not true. Some fractures still allow limited weight-bearing, and some severe sprains make walking impossible.
A few signs suggest you should get an X-ray rather than assuming it’s just a sprain. Doctors use a set of guidelines called the Ottawa Ankle Rules to make this call. The red flags are: you can’t put weight on the foot immediately after the injury, you can’t take four steps even after some time has passed, or you have tenderness when you press directly on the bony points on either side of your ankle (not just the soft tissue around them). If the ankle looks visibly deformed, with an unusual angle or a bump where there shouldn’t be one, that strongly suggests a fracture or dislocation rather than a sprain.
What to Expect Over the First Week
The visual timeline of a sprained ankle follows a fairly predictable pattern. In the first few hours, swelling builds quickly. By the end of the first day, the ankle is at or near its maximum puffiness. Bruising begins appearing on day two or three and continues to spread and darken through days four and five. During this period, the ankle often looks worse than it did right after the injury, which can be alarming but is normal.
By the end of the first week, swelling in a mild sprain is usually noticeably reduced. Moderate sprains still show significant puffiness at this point. The bruising starts its color shift from deep purple toward green and yellow. If swelling is getting worse rather than better after three or four days, or if new bruising keeps appearing well into the second week, that’s worth having evaluated, as it could indicate a more serious injury than initially assumed.
For a Grade 1 sprain, the ankle typically looks close to normal within one to two weeks. Grade 2 sprains can take three to four weeks before the visible swelling and discoloration fully resolve. Grade 3 sprains may show residual puffiness for six weeks or longer, even as the pain improves.