Gout looks like a sudden, intensely swollen joint with deep redness and shiny, stretched skin. The affected area often appears so inflamed that it can be mistaken for an infection. Most commonly striking the base of the big toe, a gout flare transforms a normal-looking joint into one that’s visibly puffy, discolored, and hot to the touch within hours.
What an Acute Gout Flare Looks Like
During a flare, the joint swells noticeably and the overlying skin turns red or purplish. The skin often looks tight and glossy because the swelling stretches it. The redness can extend beyond the joint itself, spreading into the surrounding soft tissue, which is one reason gout is sometimes confused with a skin infection like cellulitis.
The big toe is the most recognizable location. A gout flare there makes the entire base of the toe balloon outward, sometimes doubling its normal size. The redness can extend across the top of the foot. Walking becomes extremely difficult or impossible, and even the light pressure of a bedsheet can be unbearable. These features, the inability to use the joint, extreme touch sensitivity, and visible redness, are so characteristic that doctors use them as formal diagnostic criteria.
Flares can also hit the ankle, knee, wrist, or fingers. In the knee, swelling may be more diffuse and harder to spot visually, but warmth and puffiness around the kneecap are typical. In the hands, individual finger joints swell and feel hot, the skin discolors, and the fingers can look stiff and sausage-like. A flare typically peaks within 12 to 24 hours, and the redness and swelling gradually fade over a week or two.
How It Differs From an Infection
A gout flare and cellulitis (a bacterial skin infection) can look strikingly similar. Both cause redness, swelling, and warmth. The key visual difference is that gout centers on a joint and radiates outward, while cellulitis tends to spread more evenly through the soft tissue without a clear joint epicenter. Gout can also cause skin peeling or flaking as the flare resolves, which can mimic the excoriated, raw-looking skin seen in infections.
If redness and swelling keep getting worse despite anti-inflammatory treatment, or if you develop a fever with spreading redness, an infection rather than gout becomes more likely. In practice, even experienced clinicians sometimes need lab work or imaging to tell the two apart.
What Tophi Look Like
If gout goes untreated for years, uric acid crystals can accumulate into visible lumps called tophi. These are firm, roundish nodules that form under the skin, ranging from as small as a pea to as large as a tangerine. They feel hard or rubbery and are usually painless at first, though they can become tender as they grow.
Tophi often have a chalky white or yellowish appearance beneath the skin. Sometimes a white head develops on the surface, similar in look to a large whitehead or cyst, where crystallized uric acid is working its way out. These can actually break open and discharge a gritty, white paste-like material.
The most common locations for tophi are around the joints already affected by gout: the big toe, fingers, wrists, and elbows. But they also show up in surprising places. The outer rim of the ear is a classic spot where small, pearly-white nodules appear just under the skin. Tophi can also form on the nose, along tendons like the Achilles, and in rare cases internally on heart valves or in the kidneys.
Over time, large tophi can permanently change the shape of your joints. Fingers can become knobby and misshapen, with visible lumps distorting the normal contour of each knuckle. In severe cases, surgery is needed to remove tophi that limit joint function or cause cosmetic changes to the hands.
What Gout Looks Like on Imaging
If your doctor orders an ultrasound, gout has a signature appearance. Uric acid crystals coat the surface of cartilage inside the joint, creating what’s called a “double contour sign”: the ultrasound shows two bright lines instead of one along the cartilage surface. One line is the cartilage itself, and the second is a layer of deposited crystals sitting on top. This finding is considered the single most reliable ultrasound marker for gout and is part of the formal classification guidelines used internationally.
Specialized CT scans can also detect uric acid deposits by color-coding them, making crystal deposits glow green against the normal bone and tissue. These imaging tools are most useful when the diagnosis is uncertain or when a doctor wants to see how much crystal buildup has accumulated before it becomes visible on the skin surface.
How Gout Changes Over Time
Gout’s appearance evolves through distinct stages. In early gout, uric acid levels are elevated but nothing looks abnormal. You’d never know anything was wrong from looking at the joint. The first flare arrives suddenly, with dramatic redness and swelling that resolves completely, leaving the joint looking entirely normal again.
With repeated flares, the joint may not fully return to baseline between episodes. You might notice mild, persistent puffiness or slight discoloration that lingers. The skin over frequently affected joints can start to look thickened.
In advanced gout, tophi become the dominant visual feature. Joints look lumpy and deformed rather than acutely swollen. The dramatic redness of an acute flare gives way to a more chronic, knobby appearance. At this stage, the damage to joint shape can be permanent even if uric acid levels are finally brought under control, though tophi themselves can slowly shrink with sustained treatment.