Must one make up only the actual days of menstruation or all the days one bled after purifying from the previous menses?

The drops that appeared after ten days from the cessation of menstruation are considered istihadah (definition) (irregular bleeding), because they appeared after less than the minimum period of purity between two menstruations. Her menstrual period is the usual duration she used to menstruate. Her fasting on the days preceding her usual period is valid, and she is not required to make up for them.