Ringworm on the skin typically clears within 2 to 4 weeks with over-the-counter antifungal treatment. That’s the standard case for infections on the body, groin, or feet. But the timeline varies significantly depending on where the infection is, and untreated ringworm can persist for months or even longer since it won’t resolve on its own.
Skin Ringworm: 2 to 4 Weeks
The most common type of ringworm appears on the arms, legs, trunk, or face as a red, scaly ring that expands outward. With a topical antifungal cream or ointment applied twice daily, the rash usually clears in about 2 to 3 weeks. The visible ring often fades before the fungus is fully gone, which is why you should keep applying the medication for at least 7 to 10 days after the rash disappears. Stopping too early is one of the most common reasons ringworm comes back.
Jock itch and athlete’s foot are caused by the same group of fungi and follow a similar timeline: 2 to 4 weeks of consistent topical treatment. Athlete’s foot can be stubborn if moisture stays trapped between the toes, so keeping the area dry speeds things along.
Scalp Ringworm: 6 Weeks to 3 Months
Scalp infections are a different situation entirely. Topical creams can’t penetrate the hair follicle where the fungus lives, so this type requires prescription oral antifungal medication. Both children and adults need to take the medication for at least six weeks, and some cases require up to three months of treatment before the infection fully clears. Your doctor may also recommend a medicated shampoo to reduce the spread of fungal spores during treatment, though the shampoo alone won’t cure the infection.
Scalp ringworm is most common in children and can cause patchy hair loss. The hair typically grows back once the infection resolves, but delays in treatment can sometimes lead to scarring that makes hair loss permanent in that area.
Nail Infections: Months to a Year
When ringworm fungi infect a toenail or fingernail, the timeline stretches dramatically. Oral antifungal medication is typically taken for 6 to 12 weeks, but you won’t see the full results until the damaged nail grows out and is replaced by a healthy one. That process can take four months or longer for fingernails and closer to a year for toenails, which grow more slowly. Some topical nail treatments need to be applied daily for nearly a year.
What Happens Without Treatment
Ringworm does not go away on its own. Without antifungal medication, the infection persists as long as the fungus is alive in your skin, and it will likely spread. The ring can grow larger, additional rings can form nearby, and you remain contagious to others the entire time. There’s no set expiration date for an untreated infection. It can linger indefinitely, waxing and waning but never fully clearing.
The fungal spores themselves are remarkably durable. Research on dermatophyte survival has shown that common ringworm species can remain viable in shed skin cells for 6 to 26 months at room temperature, depending on the species. This means contaminated surfaces, clothing, towels, and bedding can reinfect you or spread the fungus to others long after initial contact.
How Long You Stay Contagious
You’re contagious for as long as the untreated rash is present. Once you start antifungal treatment, you’re generally considered no longer contagious after about 48 hours. That’s the typical guideline schools and daycares use for allowing children to return. You should still cover the affected area during this window and avoid sharing towels, clothing, or direct skin contact with the rash.
Why Some Cases Take Longer
If your ringworm hasn’t improved after a full course of treatment, several things could be going on. The most common culprit is simply not using the medication long enough or consistently enough. But resistant strains of ringworm fungi have been emerging in recent years, and the CDC has flagged several factors driving this trend: using combination products that mix antifungals with steroids (which can actually help the fungus spread), stopping treatment too early, and using over-the-counter antifungals incorrectly.
One strain in particular, called T. indotineae, has been causing severe infections that cover large areas of the body and resist standard treatment. Patients with resistant infections may need months of oral medication and sometimes a switch to a different class of antifungal drug. If your rash is spreading despite treatment, or if the ring keeps growing after two weeks of consistent use of an antifungal cream, that’s a sign you need a prescription-strength approach rather than continuing with over-the-counter options.
Preventing Reinfection
Reinfection is the reason many people feel like their ringworm “won’t go away” even after successful treatment. Because fungal spores survive for months on surfaces, you need to address the environment alongside the skin. Wash bedding, towels, and clothing that touched the rash in hot water. Disinfect shared surfaces like gym equipment and shower floors. If a pet in your household has patchy fur or scaly skin, they may be carrying the fungus and need veterinary treatment too.
Keeping skin clean and dry helps prevent new infections, since the fungi thrive in warm, moist environments. Wearing breathable fabrics, changing socks frequently, and using shower shoes in communal areas all reduce your risk. If you’ve had ringworm once, your skin isn’t immune to getting it again from the same sources.