Sayyidah Umm Salamah (may Allah be pleased with her) said: In the time of the Prophet (peace and blessings be upon him), women in postnatal bleeding (nifas) would sit for forty nights or forty days after giving birth, and we would rub wars (a yellow plant dye) on our faces for dark spots.
Abu al-Walid narrated it from Zuhayr, from Abd al-A'la, and that is not mahfuz (preserved).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1606