Yeah, I know I should go and see a doctor of course, it’s just not that easy during quarantine as I live far from him (like 30/40 minutes from where I’m staying), and the rules are quite strict here. And going to an hospital is, basically, out of question.
Anyway, I also thought it could be balanitis, but it should be a very bland one in that case: I don’t have any of the symptoms I read, I just have those marks with no itching or any kind of pain while pissing etc.