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Ringworm Causes: Triggers and Risk Factors

Ringworm is caused by fungal organisms called dermatophytes and is highly contagious. Learn about the most common causes and risk factors.

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Ringworm is caused by fungal organisms called dermatophytes and is highly contagious. Learn about the most common causes and risk factors.

What is Ringworm?

Ringworm (medically known as Tinea corporis) is a fungal skin infection caused by microscopic fungi called dermatophytes. It typically appears as ring-shaped, red, scaly patches on the skin. Despite its name, ringworm has nothing to do with worms – it is purely a fungal infection.

Causes of Ringworm

The primary cause of ringworm is infection with dermatophytes, which are fungi that feed on keratin – the protein found in skin, hair, and nails. The most common causative organisms include:

Trichophyton rubrum – the most prevalent dermatophyte worldwide
Trichophyton tonsurans – especially common in children and scalp infections
Microsporum canis – frequently transmitted through cats and dogs
Epidermophyton floccosum – mainly affects skin and nails

Routes of Transmission

Ringworm is contagious and can spread in several ways:

Direct contact with an infected person or animal (e.g., pets)
Indirect contact via contaminated items such as towels, clothing, combs, or sports equipment
Contact with contaminated surfaces in moist environments like swimming pools, communal showers, or locker rooms
Zoonotic transmission: transfer of the fungus from animals (especially cats, dogs, guinea pigs) to humans

Risk Factors

Certain factors increase the likelihood of developing ringworm:

Weakened immune system (e.g., due to HIV infection, diabetes mellitus, or immunosuppressive medications)
Close physical contact during sports (e.g., wrestling, judo)
Excessive sweating and poor skin hygiene
Young age – children are more susceptible due to a less fully developed immune response
Living in warm, humid climates – fungi thrive in warm and moist environments
Close contact with animals, particularly pets that may carry dermatophytes
Skin injuries or breaks in the skin that serve as entry points for fungi

How the Infection Develops

Once dermatophytes come into contact with the skin, they begin breaking down the keratin in the outer skin layer and multiplying. The characteristic ring-shaped lesions form because the fungus spreads outward in a circular pattern. The inflammatory reaction – redness, scaling, and itching – is most intense at the outer edge of the growing ring, while the center may appear relatively normal as the immune response has partially cleared the infection there.

When to See a Doctor

Medical advice should be sought if:

the ring-shaped skin lesions spread or do not resolve on their own
children or immunocompromised individuals are affected
fever or general illness accompanies the skin changes
the scalp or nails are involved

References

Robert Koch Institut (RKI): Information on Mycoses – Dermatophytoses. www.rki.de
Nenoff P. et al.: Dermatophytoses – Diagnosis and Treatment. Deutsches Aerzteblatt, 2014; 111(29-30): 502–510.
World Health Organization (WHO): Skin infections – Overview and prevention. www.who.int

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