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 صلى الله عليه وسلم وَتَحْتَ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ - اسْتُحِيضَتْ سَبْعَ سِنِينَ اسْتَفْتَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم فِي ذَلِكَ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنَّ هَذِهِ لَيْسَتْ بِالْحَيْضَةِ وَلَكِنْ هَذَا عِرْقٌ فَاغْتَسِلِي وَصَلِّي " .
Nesai
The Book of Purification • Hadith 205