Get some DMSO (a natural solvent) and mix it with essential oils. Apply it all around the area let it absorb for a few minutes then press a hot towel over it to push it in deeper.
Make sure you have not used any chemicals or cleaners/soap with chemicals because they will react to essential oils...
and test a little sample area to make sure you will not be adversely affected by the essential oil you use. You do not need a super powerful one like oregano...all of them kill parasites virus's etc. But you do need a high quality essential oil like Young Living.