Purity: Bleeding During Ghusl

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 414:

If bleeding does not stop at the time of performing ghusl, the ghusl is valid. However, if while performing ghusl, medium istiḥāḍah becomes excessive, it is necessary to start the ghusl all over again.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)