Praise be to Allah.
We know of no evidence (daleel) to indicate that bleeding from any part of the body other than the vagina invalidates one’s wudoo’. The basic principle is that it does not break wudoo’. Acts of worship should be based on sound reports, so no one is permitted to say that any act of worship is prescribed by Islam unless he has evidence. Some scholars suggested that wudoo’ is broken if the amount of blood lost from any place other than the vagina is considered to be excessive. If a person in this condition does wudoo’ in order to be on the safe side, then this is good, because the Prophet (peace and blessings of Allaah be upon him) said: “Leave that which makes you doubt for that which does not make you doubt.” (Reported by al-Nisaa’i, 8/328; al-Tirmidhi, 7/221 Tuhfat al-Ahwadhi; al-Haakim, 2/13, 4/99). See also Question #2570. And Allaah knows best.