Does blood from a wound after shaving the pubic area invalidate Wudu and Salah, or is the blood of a believer pure?

The emission of blood does not invalidate ablution (wudu’). Human blood is ritually impure (najis), however, jurists have stated that a small amount of it is excused. Prayer is invalidated by blood if one is aware of it and intentionally prays with it. But for someone who was unaware until after performing the prayer, their prayer is valid. Nothing is required of the questioner if they were unaware of the presence of blood before the prayer. However, if they were aware of it and it was considerable by common estimation, then they must repeat those prayers.