Tinea Corporis

Key facts

• Tinea corporis, commonly called ringworm, is a superficial fungal skin infection caused by dermatophytes; no worm is involved.
• It produces one or more ring-shaped patches with a raised, scaly border and a clearer centre, most often on the arms, legs, or trunk, and can spread or merge if left untreated.
• Dermatophytes thrive in warm, humid conditions and spread through skin contact or shared towels and clothing, so sweating under clothing and contact sports raise the risk.
• Topical antifungals such as terbinafine clear most cases; oral griseofulvin is an option for extensive or persistent infections.

What it looks like and how it spreads

Tinea corporis produces one or more ring-shaped patches with a raised, scaly border and a clearer centre, most often on the arms, legs, or trunk. Itching is typical, and the patches can spread or merge if left untreated. Dermatophytes thrive in warm, humid conditions, which is why outbreaks often flare during hot, sweaty weather. Close physical contact, shared towels and clothing, and crowded living conditions all make person-to-person spread more likely.

Clearing the infection

Most cases respond well to topical antifungals. Creams containing terbinafine are widely used and typically clear the infection within one to two weeks of consistent application. Griseofulvin taken orally is an option for more extensive or persistent infections, or where topical treatment is impractical.

Treatment should continue for the full recommended course even after the rash looks better: stopping early is the most common reason for relapse. Keeping the affected area clean and dry, wearing breathable fabrics, and not sharing personal items all support recovery and reduce the chance of reinfection.

When to see a doctor

Consult a doctor if the rash spreads rapidly, is very inflamed, or does not improve after two weeks of treatment.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.