The Centers for Disease Control and Prevention (CDC) has issued new clinical guidance regarding Trichophyton mentagrophytes type VII (TMVII), a sexually transmissible form of ringworm. Primarily affecting men who have sex with men, this fungal infection manifests as round rashes on the arms, buttocks, trunk, genitals, and legs.
In Plain English: The Clinical Takeaway
- Not your average ringworm: Unlike other types of ringworm, TMVII is primarily associated with sexual activity, requiring a different approach to screening and patient history.
- Diagnostic vigilance: If a patient presents with lesions on or near the genitals, groin, buttocks, or perineum, clinicians should consider TMVII, as it is often mistaken for eczema or other common STIs.
- Treatment duration: Recovery is not immediate. Patients should expect an antifungal regimen lasting 6 to 12 weeks or longer before the lesions have fully resolved.
Epidemiology and Clinical Presentation of TMVII
Ringworm is a fungal infection caused by dermophytes that are spread through skin-to-skin contact or contact with some objects like clothing or sheets. Since 2024, a new type has been circulating in the United States caused by Trichophyton mentagrophytes type VII (TMVII). The largest cluster of cases has been in Minnesota.
The clinical presentation of TMVII includes round rashes on the arms, buttocks, trunk, genitals, and legs. Because lesions can appear on the perineum, genitals, and buttocks, there is a risk of it being mistaken for other sexually transmitted infections (STIs) or skin conditions. Clinicians are advised to take a detailed history, including questions about sexual exposure, recent travel, and whether they’ve used over-the-counter creams or ointments.
TMVII is spread the same way as other ringworm infections, but it is primarily associated with sexual activity. To stop the spread, it is recommended to avoid skin-to-skin contact, including sex while lesions are present, and to avoid personal items such as towels, bedding, clothing, razors, or sex toys.
Clinical Management and Therapeutic Protocols
The CDC is asking clinicians to pay close attention to possible infections. Once a diagnosis is suspected, providers are encouraged to contact their health department for help with testing, reporting, and clinical management. If a clinician strongly suspects TMVII, they should start treatment with an oral antifungal drug right away and continue to follow up.
| Feature | Traditional Ringworm | TMVII (T. mentagrophytes type VII) |
|---|---|---|
| Primary Transmission | Skin-to-skin, objects (clothing/sheets) | Primarily associated with sexual activity |
| Common Locations | Scalp, feet, groin | Arms, buttocks, trunk, genitals, legs |
| Treatment Duration | Not specified | 6–12+ weeks |
Contraindications & When to Consult a Doctor
Patients should seek treatment as soon as possible if they have a rash, as it is considered very contagious.
Patients should seek medical consultation if they observe:
- A rash that is red, itchy, and scaly at the center.
- Lesions on the face, beard, or in other places with hair.
- Lesions on or near the genitals, groin, buttocks, or perineum.
Public Health Implications and Research Transparency
The CDC is providing guidance to clinicians to ensure early recognition of infections. If a health department suspects an outbreak, they should reach out to the CDC directly via email. The CDC also provides help with testing and treatment issues via email.
For further information on reporting potential outbreaks, healthcare providers are directed to contact their health department for help with testing, reporting, and clinical management.
References
- Centers for Disease Control and Prevention. CDC Offers Guidance on Sexually Transmitted Ringworm (TMVII).
Disclaimer: This article is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
