I have the same type of marks. The thing is, I have worked out with weights all my life. Personally, I also thought they were stretch marks, but two LLMD both felt they were 100% bartonella, even with my background. At first I didn't agree, but I have them in places were they are not typically for weightlifters, like on the opposite side of my elbow. The other symptoms that I was told were "classic" bartonella by both docs is the pronounced abdomen, aka the beer belly, when I had previously have a flat stomach with defined abdominal muscles. When that happened, I knew something was wrong. Also, the bottom of my feet hurt all the time and I have horrible GI symptoms.
Do you have any of these?