Abu Hurairah reported that Khawlah daughter of Yasar came to the Prophet ﷺ and said:
Messenger of Allah, I have only one clothe and I menstruate in it, how should I do ? He said: When you are purified, wash it and pray in it. She asked: If the blood is not removed, (then what) ? He said: It is enough for you to wash the blood, its mark will not do any harm to you.

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، أَخْبَرَنَا ابْنُ لَهِيعَةَ، عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، عَنْ عِيسَى بْنِ طَلْحَةَ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ خَوْلَةَ بِنْتَ يَسَارٍ، أَتَتِ النَّبِيَّ ﷺ فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّهُ لَيْسَ لِي إِلاَّ ثَوْبٌ وَاحِدٌ وَأَنَا أَحِيضُ فِيهِ فَكَيْفَ أَصْنَعُ قَالَ " إِذَا طَهُرْتِ فَاغْسِلِيهِ ثُمَّ صَلِّي فِيهِ " . فَقَالَتْ فَإِنْ لَمْ يَخْرُجِ الدَّمُ قَالَ " يَكْفِيكِ غَسْلُ الدَّمِ وَلاَ يَضُرُّكِ أَثَرُهُ " .