Necrotising arachnidism
Necrotising arachnidism' is a medical condition caused by a spider bite. It is very painful and could need skin grafts. Doctors are still unclear about the condition. It is believed to be caused by the bite of the white-tailed spider and the black house spider. However, only a very small number of people that are bitten develop necrotising arachnidism. In some of these cases it cannot be proved that there was a spider bite at all. There is no definitive treatment for the condition.