It was narrated that ‘Aa’ishah said: Faatimah bint Abi Hubaysh came to the Prophet (peace and blessings of Allaah be upon him) and said, “O Messenger of Allaah, I am a woman who suffers from istihaadah (prolonged non-menstrual vaginal bleeding) and I never become pure. Should I give up praying?” The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “No, rather that is a vein and it is not hayd (menstruation). When your period comes, stop praying, and when it goes away, wash the blood from yourself and pray, then do wudoo’ for every prayer until that time [of menstruation] comes.”
Narrated by al-Bukhaari, 226; Muslim, 33