Question: What is the ruling on the blood that comes out of a woman outside the menstrual or post-partum period? Should she make up later for the days in which she experiences such blood during the daytime of Ramadaan?
Answer: All praise be to Allaah Alone, and peace and blessings be upon the Messenger of Allaah, his family and Companions.
If the blood referred to above comes out of her during the daytime in Ramadaan and it is not menstrual blood or postpartum blood, she is obliged to observe Sawm (Fasting) and Salaah (Prayer). She must not stop observing Sawm or Salaah, and she does not need to make up later for the days in which she observed Sawm and Salaah while having Istihaadah (abnormal vaginal bleeding outside the menstrual or post-partum period)… read more here.