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Ringworm and fungal infection treatment

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CDC ringworm treatment topical antifungal when see healthcare provider

Ringworm is a superficial fungal skin infection, also called tinea. It may affect the body, groin, feet, scalp, or nails. A ring-shaped, itchy, scaly rash is common, but not every fungal rash looks like a ring.

Treatment for mild skin ringworm

For a small rash on the body, groin, or feet, an over-the-counter antifungal is usually reasonable:
  • Terbinafine 1% cream or gel: apply as directed on the pack, commonly once or twice daily.
  • Clotrimazole 1% or miconazole 2% cream: commonly twice daily.
Apply to the rash and about 1-2 cm beyond its edge. Continue for the full course on the label and for about 1 week after the skin looks clear, since stopping early can cause recurrence. Topical treatment is generally applied twice daily; athlete's foot may need a longer course. Harrison's Principles of Internal Medicine, 22nd ed., Dermatophytosis section.

Self-care and prevention

  • Keep the area clean and thoroughly dry, especially between toes and in the groin.
  • Change socks and underwear daily. Wear loose, breathable clothing.
  • Do not share towels, clothes, razors, footwear, or sports equipment.
  • Wash towels, bedding, and clothing regularly.
  • Treat athlete's foot at the same time if present, because it can re-seed the groin or body.
  • Check household pets if they have hair loss or scaly skin, as they can spread ringworm.

Avoid

  • Do not use steroid-only creams such as hydrocortisone, betamethasone, or combination steroid-antifungal creams unless a clinician specifically tells you to. Steroids can mask and worsen fungal infection, producing “tinea incognito.” The CDC ringworm guidance specifically advises against using OTC steroid creams for suspected ringworm or an undiagnosed rash.

See a clinician promptly if

  • It is on the scalp or beard area, since this usually needs prescription oral antifungal treatment.
  • Nails are thick, discolored, brittle, or lifting, since confirmed nail fungus often needs prescription treatment and takes months to clear.
  • The rash is widespread, painful, oozing, markedly inflamed, or involves the face/eyes.
  • You have diabetes, reduced immunity, are pregnant, or it is in a young child.
  • It has not clearly improved after about 2 weeks of correctly used topical treatment.
  • It keeps returning, spreads despite treatment, or began after travel or close contact with someone who has a severe, persistent rash. Some resistant forms need testing and prescription medicines.
Not every itchy or scaly rash is fungal. Eczema, psoriasis, contact dermatitis, and bacterial skin infections can look similar. A clinician can confirm it with a simple skin scraping if uncertain. The CDC treatment page notes that creams, lotions, powders, and oral medicines may be used depending on the site and severity.
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