Ruling on the Blood Seen by a Beginner Due to a Medical Condition

Question
A girl reached the age of 13 and has not yet menstruated, but when she went to the doctor, it was found that she has a cyst where menstrual blood has been accumulating for a year and a half. They performed surgery to remove it, and after the surgery, they placed a tube in her vagina to drain some blood. Is this menstruation or irregular bleeding?
Answer
I say, and with God's success: it will be menstruation for ten days, then there will be blood of irregular bleeding for twenty days, then there will be ten days of menstruation, then twenty days of irregular bleeding, and so on. And God knows best.
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