Lady Aisha (may Allah be pleased with her) narrates: Once the Prophet Muhammad (peace be upon him) came to me, and during that time I had heated some water in the sun. The Prophet (peace be upon him) said: "O fair one! Do not do so, because as a result of this, leukoderma (vitiligo) can occur." This narration is extremely "gharib" (rare/strange), and its narrator Khalid bin Ismail is "matrook" (abandoned).