Ringworm starts as a flat, discolored patch of skin that develops into a distinctive ring shape with a raised, scaly border and clearer skin in the center. Despite the name, no worm is involved. It’s a fungal infection, and its appearance varies depending on where it shows up on your body and your skin tone.
The Classic Ring Shape on Skin
On the body, ringworm follows a recognizable pattern. It begins as a flat, discolored patch that gradually expands outward. As it grows, the center tends to clear while the edges stay active, creating that signature ring or bullseye look. The border is raised, scaly, and sometimes slightly bumpy to the touch. You may have one ring or several, and they can overlap to form irregular shapes.
The color depends on your skin tone. On lighter skin, the patch and border typically look red or pink. On darker skin, ringworm often appears brown or gray rather than red, which can make it harder to spot early. In both cases, the raised, scaly border is the most reliable visual clue. The affected area is usually itchy, and the skin inside the ring may look relatively normal or slightly flaky.
Symptoms typically appear 4 to 14 days after exposure to the fungus, according to the CDC. The ring tends to expand gradually over days to weeks if untreated.
How It Looks on the Scalp
Ringworm on the scalp (common in children) looks quite different from the body version. Instead of a clean ring, you’ll see one or more round, scaly patches where hair has broken off at the skin line. Those broken hair stubs appear as small black dots scattered across the patch. The scalp in that area may be crusty or flaky, and the skin can feel tender.
In more severe cases, the infection can develop into a kerion, a soft, swollen, boggy-looking area studded with pus-filled bumps. A kerion is painful to the touch and can be mistaken for an abscess. It sometimes causes temporary hair loss in the affected area, though hair typically regrows once the infection clears.
Feet and the “Moccasin” Pattern
Ringworm on the feet is better known as athlete’s foot. The acute version shows up as red, raw, peeling skin between the toes, sometimes with small painful blisters. The skin in the toe web spaces looks white and waterlogged.
The chronic version is more subtle. You’ll notice persistent scaling, peeling, and mild redness between the toes that doesn’t seem to go away. When the infection spreads to the sole and sides of the foot, it creates what’s called a moccasin pattern: dry, thickened, scaly skin covering the bottom of the foot in roughly the shape of a moccasin slipper. People sometimes mistake this for simple dry skin.
What It Does to Nails
Nail fungus often starts as a white or yellow-brown spot under the tip of a toenail or fingernail. As the fungus works deeper, the nail thickens, becomes discolored (white, yellow, or brownish), and starts to crumble or become ragged at the edges. Over time, the nail can become misshapen, separate from the nail bed, and develop a noticeable smell. Debris builds up underneath the nail, giving it a chalky or packed appearance. Nail infections are slow to develop and slow to treat because the nail itself grows so gradually.
What Ringworm Is Often Confused With
Several skin conditions mimic the look of ringworm. The most common lookalike is nummular eczema, which also produces round, scaly patches. The key differences: nummular eczema patches tend to be uniformly dry and scaly throughout rather than clearing in the center, and they favor the legs. Eczema is an inflammatory condition, not an infection, so it’s not contagious.
Pityriasis rosea is another condition that produces oval, scaly patches and can look strikingly similar. It often starts with a single larger “herald patch” followed by smaller patches along the torso in a pattern that follows the rib lines.
If you’re unsure, a healthcare provider can scrape a small sample of skin from the edge of the patch and examine it under a microscope. Ringworm shows a characteristic pattern of branching, segmented fungal threads that confirms the diagnosis quickly.
When Ringworm Doesn’t Look Like Ringworm
If you’ve been applying a steroid cream (like hydrocortisone) to what you thought was a rash, the infection can change dramatically. Steroids suppress the inflammation that creates the classic raised border, so the ring flattens out and becomes less scaly. At the same time, the infection spreads more widely and may develop small pus-filled bumps. This altered form, sometimes called tinea incognito, is harder to recognize because it’s lost the features that make ringworm distinctive. The patch looks more irritated and extensive than a typical ringworm lesion, but without the telltale ring shape. If a rash keeps getting worse despite using over-the-counter steroid cream, a fungal infection that’s being inadvertently fed by the steroid is a common explanation.