(the wife of the Prophet) Um Habiba got bleeding in between the periods for seven years. She asked Messenger of Allah ﷺ about it. He ordered her to take a bath (after the termination of actual periods) and added that it was (from) a blood vessel. So she used to take a bath for every prayer.  

عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ أُمَّ حَبِيبَةَ اسْتُحِيضَتْ سَبْعَ سِنِينَ فَسَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنْ ذَلِكَ فَأَمَرَهَا أَنْ تَغْتَسِلَ فَقَالَ هَذَا عِرْقٌ فَكَانَتْ تَغْتَسِلُ لِكُلِّ صَلاَةٍ  

"That is not menstruation, rather it is a vein. Tell her not to pray for the period of time that her period used to last, then let her perform Ghusl and pray." She used to perform Ghusl for every prayer.  

أَنَّ ابْنَةَ جَحْشٍ كَانَتْ تُسْتَحَاضُ سَبْعَ سِنِينَ فَسَأَلَتِ النَّبِيَّ ﷺ فَقَالَ لَيْسَتْ بِالْحَيْضَةِ إِنَّمَا هُوَ عِرْقٌ فَأَمَرَهَا أَنْ تَتْرُكَ الصَّلاَةَ قَدْرَ أَقْرَائِهَا وَحِيضَتِهَا وَتَغْتَسِلَ وَتُصَلِّيَ فَكَانَتْ تَغْتَسِلُ عِنْدَ كُلِّ صَلاَةٍ  

"That is not menstruation, rather it is a vein. Tell her not to pray for the amount of time that her period used to last, then let her perform Ghusl and pray.' She used to perform Ghusl for every prayer.  

أَنَّ أُمَّ حَبِيبَةَ بِنْتَ جَحْشٍ كَانَتْ تُسْتَحَاضُ سَبْعَ سِنِينَ فَسَأَلَتِ النَّبِيَّ ﷺ فَقَالَ لَيْسَتْ بِالْحَيْضَةِ إِنَّمَا هُوَ عِرْقٌ فَأَمَرَهَا أَنْ تَتْرُكَ الصَّلاَةَ قَدْرَ أَقْرَائِهَا وَحَيْضَتِهَا وَتَغْتَسِلَ وَتُصَلِّيَ فَكَانَتْ تَغْتَسِلُ عِنْدَ كُلِّ صَلاَةٍ