Is it necessary to repeat the ablution if blood from acne begins to flow after performing ablution, and the bleeding continues for several minutes?

The preponderant opinion is that ablution remains valid, as blood from sources other than the two excretory passages does not invalidate ablution. If blood from a boil exits on its own, it is excused. If it is a large amount, it is recommended to wash it if it becomes excessive. If the blood exits due to peeling or squeezing, a small amount is excused, but a large amount must be washed, because you were the cause of its exit.