اللَّهُمَّ بَيِّضْ وَجْهِي يَوْمَ تَبْيَضُّ وُجُوهٌ وَتَسْوَدُّ وُجُوهٌ
Allahumma bayyid wajhi yawma tabyadduwujuhun wa taswaddu wujuh
O Allah, brighten my face on the Day when faces will be brightened and faces will be darkened.
While washing the face during wudu
This dua asks Allah for salvation on the Day of Judgment.