Untreated ringworm doesn’t go away on its own. The fungal infection continues to grow outward on your skin, and you remain contagious to others for as long as the infection is active. What starts as a small, itchy ring can expand to cover larger areas of skin, spread to other parts of your body, and in some cases cause complications like bacterial infections, deeper tissue involvement, or permanent scarring.
The Infection Spreads and Gets Worse
Ringworm is caused by a fungus that feeds on the outer layer of your skin. Without antifungal treatment, it has no reason to stop. The characteristic red, scaly ring grows outward while the center may appear to clear, giving the misleading impression that it’s healing. In reality, the active edge of infection keeps expanding and can eventually cover large sections of skin.
The fungus can also spread to new parts of your body through a process called auto-inoculation. Touching or scratching an infected patch and then touching another area transfers the fungus. An infection that started on your arm can easily move to your groin, feet, face, or scalp. Each of these locations has its own name (jock itch, athlete’s foot, scalp ringworm), but they’re all caused by the same type of fungus. Once you have multiple infected sites, treatment becomes more complicated and often requires oral medication rather than a simple cream.
You Stay Contagious the Entire Time
A person with ringworm is contagious for as long as the infection is active or the fungus remains on contaminated materials like towels, bedding, or clothing. Without treatment, that window has no end point. You can pass the infection to family members, pets, teammates, or anyone who shares surfaces with you. The fungus survives well on fabrics and surfaces, so even indirect contact poses a risk.
Bacterial Infections Can Develop
Ringworm makes your skin itchy, and scratching breaks the skin’s surface. Those open cracks become entry points for bacteria. According to the World Health Organization, broken skin from ringworm can become infected with bacteria, leading to cellulitis (a deeper skin infection that causes redness, swelling, and warmth) or impetigo (crusty, oozing sores). Bacterial infections on top of a fungal infection are harder to treat because you now need antibiotics in addition to antifungals, and the healing timeline gets significantly longer.
The Fungus Can Go Deeper
Ringworm normally stays in the outermost layer of skin. But when it’s left untreated, especially if you scratch the area or shave over it, the fungus can penetrate deeper into the tissue. This deeper infection is called Majocchi granuloma, and it’s a significant step up in severity from ordinary ringworm.
In otherwise healthy people, Majocchi granuloma typically appears as firm, raised bumps around hair follicles, most often on the legs. Shaving is a common trigger because it damages the skin barrier and pushes fungal material deeper. In people with weakened immune systems, the infection can form larger nodules, usually on the arms, and tends to be more aggressive. The deeper the fungus goes, the less effective topical creams become. Treatment at this stage requires oral antifungal medication, sometimes for weeks.
Scalp Ringworm Risks Permanent Hair Loss
Untreated ringworm on the scalp is especially concerning because it can cause lasting damage. Scalp ringworm starts with scaly, itchy bald patches that grow larger over time. If it triggers a strong inflammatory response, a painful, swollen mass called a kerion can form. Kerions are tender nodules that ooze pus and cause significant discomfort, sometimes accompanied by a low-grade fever (around 100°F to 101°F) and swollen lymph nodes in the neck.
The real danger with kerion is scarring. The intense inflammation can destroy hair follicles permanently, leaving bald patches that never regrow. Non-inflammatory scalp ringworm generally doesn’t cause permanent scarring, but there’s no reliable way to predict which cases will become inflammatory. The longer treatment is delayed, the higher the risk of irreversible hair loss.
Skin Changes That Linger After Healing
Even once ringworm is eventually treated, skin that has been infected for a long time is more likely to leave behind visible changes. Post-inflammatory hyperpigmentation (darkened patches) and hypopigmentation (lighter patches) are common, particularly in people with darker skin tones. These color changes can take months to fade and in some cases persist much longer. Chronic or deep infections also carry a higher risk of actual scarring, especially in areas where the skin was repeatedly scratched or where secondary bacterial infections developed.
Why Steroid Creams Make It Worse
One of the most common mistakes people make with untreated ringworm is reaching for an anti-itch cream that contains corticosteroids. These creams reduce redness and itching temporarily, which makes it look and feel like the infection is improving. But steroids suppress your skin’s immune response, allowing the fungus to spread unchecked. When you stop using the cream, symptoms come back worse than before, which often leads to a frustrating cycle of applying more steroid and feeding the infection further.
This pattern creates a condition called tinea incognito, where the ringworm no longer looks like ringworm. The classic ring shape disappears, making it harder for even doctors to recognize. Meanwhile, the infection has been expanding under the surface, sometimes covering a much larger area than the original patch. In some cases, the suppressed immune response from steroid use allows the fungus to penetrate deeper, increasing the risk of Majocchi granuloma.
What Treatment Looks Like
Standard ringworm on the body responds well to over-the-counter antifungal creams applied for two to four weeks. The earlier you start, the simpler the treatment. If you’ve let the infection go for a while and it has spread to multiple body sites, gone deep into the skin, or reached the scalp, you’ll likely need prescription oral antifungal medication. Scalp ringworm almost always requires oral treatment because creams can’t penetrate the hair follicle effectively.
Infections that have become extensive, chronic, or complicated by bacterial involvement take longer to resolve and may require combination treatment. What could have been a straightforward two-week course of cream can turn into months of oral medication, antibiotics, and follow-up visits. The bottom line: ringworm is one of the easiest skin infections to treat early and one of the most frustrating to deal with once it’s been ignored.