A sprained ankle typically shows swelling around the outer ankle bone, often with bruising that spreads across the foot and up the lower leg. The severity of these visible signs depends on how badly the ligament is damaged. A mild sprain may look like a slightly puffy ankle, while a severe one can turn the entire foot deep purple and swell to nearly twice its normal size.
Mild, Moderate, and Severe Sprains
Ankle sprains are graded on a three-point scale based on how much the ligament is torn, and each grade looks noticeably different.
A grade 1 sprain involves stretching or a very slight tear. You’ll notice mild puffiness around the outside of the ankle, and the skin may look slightly pink or flushed. There’s usually no significant bruising. The ankle feels stable, and most people can still walk on it with only minor pain.
A grade 2 sprain is a partial tear. Swelling is more obvious and extends further around the ankle. Bruising starts to appear, typically on the outer side but sometimes wrapping under the foot. The area is tender to touch, and walking becomes painful. The ankle may feel slightly wobbly, like it could give way.
A grade 3 sprain is a complete ligament tear. The swelling is dramatic, sometimes making it hard to see any definition in the ankle joint at all. Bruising is widespread and deep, often covering the outer ankle, the top of the foot, and sometimes the sole. The ankle feels unstable, and putting weight on it is usually impossible because it buckles under you.
Where Bruising and Swelling Appear
Most ankle sprains injure the ligaments on the outer (lateral) side, so swelling and discoloration tend to concentrate just below and in front of the outer ankle bone. In the first few hours, swelling is the main visual change. Bruising often doesn’t show up immediately because it takes time for blood from torn blood vessels to seep into surrounding tissue.
It’s common for bruising to first appear a day or two after the injury, then gradually spread. You might wake up the morning after a sprain and see purplish discoloration that wasn’t there the night before. With grade 2 and grade 3 sprains, blood can travel downward through tissue, which is why bruising often shows up on the sole of the foot or around the toes even though those areas weren’t directly injured. This looks alarming but is a normal pattern.
Most bruising is absorbed by the body within about two weeks. As it heals, the colors shift from dark purple or blue to green, then yellow, before fading entirely. If bruising is still getting darker or spreading after several days, that can signal ongoing bleeding or a more serious injury.
High Ankle Sprains Look Different
Not all sprains happen in the same spot. A high ankle sprain injures the ligament that connects the two bones of the lower leg (the tibia and fibula) just above the ankle joint. Visually, the swelling and tenderness sit higher up on the leg, above and in front of the ankle rather than below the ankle bone. You may also notice tenderness or swelling on the inner side of the ankle.
High ankle sprains often produce less dramatic bruising than a typical lateral sprain, which can be misleading. They look less severe on the surface but tend to be more disabling. One key difference: people with standard lateral sprains can often still bear weight, while high ankle sprains make weight-bearing significantly more difficult despite sometimes looking less swollen.
How to Tell a Sprain From a Fracture
A sprained ankle and a broken ankle can look surprisingly similar, especially in the first few hours when everything is swollen. But there are visual and functional clues that help distinguish them.
- Shape of the ankle: If your ankle looks twisted, crooked, or visibly deformed compared to the other side, that points toward a fracture. Sprains cause swelling but don’t change the underlying shape of the joint.
- Where the pain is: Pain directly over the bony bumps on either side of the ankle suggests a fracture. Pain in the soft tissue between or below those bones is more typical of a sprain.
- Numbness or tingling: A sprain hurts, but it doesn’t usually cause numbness. If you lose feeling in part of your foot or ankle, a fracture is more likely.
- Ability to move: A sprain usually still allows some range of motion, even if it’s painful. A fracture can make movement feel completely locked or impossible.
Emergency physicians use a set of clinical guidelines called the Ottawa Ankle Rules to decide whether an X-ray is needed. The criteria are straightforward: if you can’t bear weight at all, if you can’t take four steps, or if there’s tenderness directly over specific bony landmarks (the tip or back edge of either ankle bone, the heel bone, or the top bone of the foot), imaging is warranted. These rules have been validated for adults and children over age five and are reliable enough that most emergency departments worldwide use them as the standard screening tool.
What to Expect in the First 72 Hours
The appearance of a sprained ankle changes quickly. In the first hour, swelling begins and may increase steadily for 24 to 48 hours. The ankle gets puffy and tight, and your shoe may not fit. Keeping the ankle elevated above your heart and applying ice in 20-minute intervals helps slow the swelling.
Bruising typically peaks around days two through four. This is when the ankle looks worst, even though healing has already begun. The discoloration can be unsettling, particularly when it spreads to unexpected places like the arch of the foot or the toes. This migration of bruising is gravity pulling leaked blood downward through tissue and is not a sign of worsening injury.
By the end of the first week, swelling in a mild sprain should be noticeably reduced. Moderate sprains may still look puffy and discolored for two weeks or more. Severe sprains with complete ligament tears can remain visibly swollen for several weeks and may leave the ankle looking slightly thicker than the uninjured side for months, even after the pain has resolved. That residual fullness is scar tissue forming around the damaged ligament.