For years the only place I had OBs was at the top of my buttocks. It was only when it suddenly started spreading, after some 13 years of OBs there, that it went beyond that due to overwhelming stress. Now I get OBs in a variety of places.
As for the oils, they have been taken internally by those who have talked about them here. Again, I'd strongly suggest you read the archive messages on this board for more info (you can do a search for the terms).
It would also be a good idea if you consulted a qualified herbalist or naturopath before trying them, if possible. At the very least, do some research first. Herbs may be "natural" but so is Belladonna (highly poisonous). Be careful with them.
People on this board who have tried OLE and OOO (taken orally) have reported a decrease in the frequency and severity of OBs. They may work differently for each person, but it might be worth checking into.