Jock itch is a fungal infection of the skin on the groin and inner area of the thighs. The medical name for jock itch is tinea cruris.

Common fungus organisms that grow best in warm, moist areas cause jock itch. Fungus can be transmitted from one person to another by:

  • Direct contact between people
  • Indirect contact (such as sharing towels that are infected with the fungus)