The Leper Halloween Face Mask - Sculpted by Erich Lubatti Leprosy, a chronic disease caused by the bacteria Mycobacterium leprae, leaving permanent damage to the skin, nerves, limbs and eyes is so eloquently depicted in this Scary Halloween Face Mask sculpted by Erich Lubatti The Leper is part of Trick or Treat Studios’ Halloween Face Mask collection. These masks are identical to the ones at Knott's Scary Farm's Halloween Haunt as Erich Lubatti makes the face masks worn by the street monsters. All of our Halloween Face Masks come with a sewn strap to fit comfortably on your face.