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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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