It was narrated from 'Aishah (may Allah be pleased with her) that Umm Habibah, an in-law of the Messenger of Allah ﷺ, who was married to 'Abdur-Rahman bin 'Awf, suffered Istihadah (non-menstrual vaginal bleeding) for seven years. She consulted the Prophet ﷺ about that and the Messenger of Allah ﷺ said:

'That is not menstruation, rather that is a vein, so perform Ghusl and pray.'"

أَخْبَرَنَا مُحَمَّدُ بْنُ سَلَمَةَ، قَالَ حَدَّثَنَا ابْنُ وَهْبٍ، عَنْ عَمْرِو بْنِ الْحَارِثِ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، وَعَمْرَةَ، عَنْ عَائِشَةَ، أَنَّ أُمَّ حَبِيبَةَ، - خَتَنَةَ رَسُولِ اللَّهِ ﷺ وَتَحْتَ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ - اسْتُحِيضَتْ سَبْعَ سِنِينَ اسْتَفْتَتْ رَسُولَ اللَّهِ ﷺ فِي ذَلِكَ فَقَالَ رَسُولُ اللَّهِ ﷺ " إِنَّ هَذِهِ لَيْسَتْ بِالْحَيْضَةِ وَلَكِنْ هَذَا عِرْقٌ فَاغْتَسِلِي وَصَلِّي " .