hey. I am dealing with this too, and have had it for over a year now. I believe its a mite the burrows in the skin. maybe scabies, or something similar. I just figured this out about a week ago and set out to rid myself of it. I got some essential oils, tea tree, lavender, peppermint and oregano. I mixed up a strong soap using the oils, and also diluted the oils in some grapeseed oil. I bath in the oil, wash with the soap, and apply the oil. I use use neem oil on it. i also am taking neem leaves internally, oil or oregano and Black-Walnut hull.
i do agree with aunty, it is some type of parasite. when i started doing this my finger erupted big time for about a week. really scary looking. it is now getting better and the itch is gone. the problem is, its hard to know where the mites are living... sheets, mattress, clothes ect must be constantly washed in very hot water, and we also use peppermint oil soap. i don't know exactly what it is, but is tough.