The
Perineal raphe is the seam line that most males have.
The question remains: where is the blood coming from?
If it's coming out of where the urine comes out, that's one thing.
It could be part of an ejaculation, blood in ejaculate is not unknown.
It could be part of the urine, that's grounds for concern about the kidneys.
It's not unheard of for intersexuals to have a vaginal opening so tiny that it's not discovered for years.