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Ringworm

Ringworm

Ringworm, medically known as tinea corporis, is a common fungal skin infection that despite its name has nothing to do with worms. It causes a distinctive circular, red, scaly rash and spreads easily through contact with infected people, pets, or contaminated surfaces. Most cases clear up well with the right antifungal treatment, but ringworm can spread and worsen if it’s mistaken for something else or left untreated. At Genesis Dermatology in Jupiter, FL, board-certified dermatologists diagnose and treat ringworm to clear the infection and stop it from spreading further.
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What Is Ringworm?

Ringworm is caused by dermatophyte fungi, organisms that naturally live on skin, hair, and nails but multiply out of control in warm, damp conditions. It spreads through direct skin-to-skin contact with an infected person, contact with an infected pet (puppies and kittens are common carriers), or contact with contaminated surfaces like gym mats, towels, or locker rooms.

Symptoms typically appear 4 to 14 days after exposure, though they can take up to two weeks in some cases. Florida’s warm, humid climate creates conditions where dermatophyte fungi thrive, which is one reason ringworm and related fungal infections are especially common here.

How to Detect Ringworm

Ringworm has a recognizable pattern, though it can be mistaken for other rashes:
  • A rash that starts as small red bumps and gradually expands into a ring shape
  • A raised, scaly, red border with a clearer center, giving the classic "ring" appearance
  • Typically, half an inch to an inch across, though it can grow larger if untreated
  • Itching or mild burning in the affected area
  • Hair loss or bald patches if the infection involves the scalp

When Should You See a Doctor?

See a dermatologist if:
  • A rash matches the ring-shaped pattern typical of ringworm, especially if it's spreading
  • Over-the-counter antifungal cream hasn't improved the rash after one to two weeks
  • The rash is on your scalp, which usually requires oral rather than topical treatment
  • You're not sure whether it's ringworm or another type of rash, since treatments for other conditions can sometimes make a fungal infection worse
  • You have multiple patches or the infection is spreading to other family members or pets

What Happens If Ringworm Is Left Untreated?

Ringworms don’t typically resolve without treatment, they tend to expand outward and can spread to new areas of your body through scratching or contact, or to other people and pets sharing your household. An infection that’s misdiagnosed and treated with a steroid cream (commonly used for other rashes) can worsen and spread more rapidly, since steroids suppress the local immune response that would otherwise help contain the fungus.

In people with weakened immune systems, untreated ringworms can become more extensive and harder to clear. Repeated scratching also raises the risk of a secondary bacterial infection developing on top of the fungal one, adding another layer of treatment to what would have been a straightforward course of antifungal medication if caught earlier.

The Genesis Dermatology Process

Here’s what to expect when you come in for a suspected ringworm infection:
  • An exam to confirm the diagnosis, sometimes a quick in-office skin scraping examined under the microscope
  • Topical antifungal treatment for most mild-to-moderate cases on the body
  • Oral antifungal medication for scalp involvement or more extensive, stubborn infections
  • Guidance on treating pets or household members if they may be a source of reinfection
  • Practical tips for preventing recurrence, especially relevant in Florida's warm, humid climate

Ready to Take the Next Step?

A spreading, ring-shaped rash is easier to clear the sooner it’s properly treated. Schedule a consultation with the board-certified dermatologists at Genesis Dermatology in Jupiter, FL, to confirm the diagnosis and start the right treatment.
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Frequently Asked Questions

Is ringworm caused by a worm?
No, despite the name, ringworm is caused by a fungus, not a worm. The name comes from the classic ring-shaped rash it produces.
Very contagious. It spreads through direct contact with an infected person, pet, or contaminated surface, and can pass through a household or team setting relatively easily if not treated.
Yes, pets, especially puppies and kittens, are common carriers and can pass the fungus to people through contact. If your pet has patches of hair loss or scaly skin, it’s worth having them checked by a veterinarian too.
Some cases, especially on the scalp or those that are more extensive, need prescription-strength topical or oral antifungal treatment. It’s also possible the rash isn’t ringworm at all, which is worth confirming with an exam.
Most body ringworms clear within 2 to 4 weeks of consistent topical treatment. Scalp infections treated with oral medication typically take a bit longer.
Yes, especially if you’re re-exposed to the fungus from an untreated pet, contaminated item, or infected household member. Addressing the source of exposure helps prevent recurrence.