POP QUIZ

Fungus: Despite its name, ringworm is a fungus, usually of the Trichophyton or Microsporum families.

Virus: Warts are caused by the equine papillomavirus.

Bacteria: Scratches is a bacterial infection of chapped skin; rainrot is caused by an overgrowth of Dermatophilus congolensis, a bacterium that naturally lives on the skin.