only limited research on the topic that i know of WBF.
i have seen papers cataloguing the skin manifestations of bartonella - mainly the striae
but what you are describing is something a little different - one of the many other forms
i have seen examples of exactly the manifestation that you mention on the breaking down bartonella FB group photos
some look exactly like a cat scratch - i mean it looks like a light linear scratch mark with is just deep enough to break the skin and draw a few dots of blood here and there along its length - which is kinda funny - given that bart is often called "cat scratch disease" - but these seem to be spontaneous - forming on their own
the most in depth discussion and research on bart and the skin i have come across is that done by Dr Marna Ericson ( lady who runs the technical side of T-Labs - and specialist in confocal laser microscopy - which can image tissues in 3D )
but it is also focussed on the streaks / striae
from memory -
-bart is found throughout the skin of infected patients - not only in the striae/streaks
-distortion of collagen bundles ( structural tissues inside skin cells )
-distortion of micro blood vessels / capillaries by bart
-distortion of lymph vessels in skim layers also
-no-one knows why the streaks are linear
-general weakening of collagen structures theorised to be involved
-some overlap with actual stretch marks - so people with bart may also be prone to stretchmarks - as well as - but separate to bart striae
interview here
https://www.youtube.com/watch?v=oxvwf47cglkpaper here
https://pubmed.ncbi.nlm.nih.gov/32884796/