For “ghost spots” (Icelandic draugablettir):
If a ghost that has been sent to attack someone is successful in touching him, then its fingers will leave behind black spots. They will become sores that will eat away at the person and eventually kill him if nothing is done to stop them. The means to use against this is explained here: One should draw around the spots with an edhalstal or segulstal [i.e., a steel magnet] and sing the Pater Noster three times; then they will not spread out any farther. Then one should go to lukewarm water prepared for washing and hold the spots in it. Then hack three, six, or nine wounds in it and pour the lukewarm water over it. If all this is done right, it will be enough.
–from the Galdrabok
