Before you jump to conclusions, try to look at it rationally. See if there is any other explanation for your scratches all over your body. You can have heat rashes or you can have skin allergy. See if there are any rational possibilities. Also, look for other subtle signs to establish if there is indeed a ghost. Only then, when you are absolutely certain that there is a ghost/unwanted spirit, then do a banishing ritual (that too is available on the JoS website).