Tall guy checking in, I have almost identical stretch marks on my back from growing fast when I was his age. He is almost certainly in the clear, especially if he's not showing bart symptoms. They'll fade with time, although you can still see mine a little bit and I'm in my mid twenties now. I wouldn't worry about it.
Thank you. I hope this is it. If I didn't have a daughter with Bartonella and lyme I would have never even considered Bartonella.
I am going to check in with the doctor anyway. Just to be sure but I do appreciate any and all responses.