this is a vein. Abstain from prayer only for a number of days similar to those of your normal menses; then, take a ritual bath and pray

Fātimah bint Hubaysh asked the Prophet (may Allah's peace and blessings be upon him) saying: I have a ceaseless flow of vaginal bleeding that continues even outside the menstrual period. Does this have the same ruling of menstruation so I should abstain from prayer?

The Prophet (may Allah's peace and blessings be upon him) replied saying: It is Istihādah (vaginal bleeding outside the menstrual period), which is a kind of illness caused by the rupture of a vein in the uterus and it is not menstrual blood. Therefore, when the time you used to experience your normal menses, before getting sick with Istihādah, do not pray, fast, or perform any act of worship that the menstruating woman must not perform during her menses.

After this period is over, you attain purity from menstruation. So, wash the place from where the blood flows and wash your whole body to remove the state of Hadath (ritual impurity), and then pray.