I am so sorry that you are dealing with thes horrible rashes. I have read of other people suffering from Bartonella rashes.
You might want to try clicking on the "Search" bar above and type something like "natural remedies for Bartonella rash Lyme ". Make sure you use the word Lyme in your search. This will bring up previous post from the Lyme community.
Here is an older post that I found:
/www.healingwell.com/community/default.aspx?f=30&m=3154683Maybe someone else will have some ideas
Best Wishes