A highly resistant fungal infection called Trichophyton indotineae is rapidly spreading throughout the United Kingdom. Originally from southern Asia, this fungus causes difficult-to-treat skin infections, particularly in the groin area, and resists standard antifungal medications in about three-quarters of cases. Since 2023, cases have spread from London to other parts of the UK and Ireland, and experts predict it will soon become the leading cause of ringworm in the country.