A rare fungus is emerging in New York, US, called “jock itch”, which causes a highly contagious rash around the genital area. The fungus that causes this infection, known as Trichophyton mentagrophytes genotype VII (TMVII), was identified as the first case in the US in June, according to US health reports.

According to the US Centers for Disease Control and Prevention (CDC), four more cases have now been reported.

“All four patients were cisgender men, aged 30-39, who reported recent sexual contact with other men. Patients A and D had sexual contact with each other,” the US health agency said in a statement. Contact was reported; patients B and C had no known epidemic.” Relationship to anyone with known TMVII infection. Patient D was a sex worker. Patient B reported travel to Europe; Each patient had no history of recent international travel.

Trichophyton mentagrophytes genotype VII (TMVII) or “jock itch” is a fungus spread through sexual contact that can cause itchy, scaly lesions on the torso, groin, genitals, or face.

Some patients may experience swelling or a painful rash that may lead to bacterial infection.

The US CDC has cautioned dermatologists to be vigilant about TMVII because it is an emerging infection that can be spread through sex.

Tinea cruris (the name of the diagnosis) can be treated with antifungal medications. While the infection may take months to heal, antifungal creams, ointments or powders can help manage the rash within 2 to 4 weeks. In some cases, long-term treatment is required.