اَللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنَ الْبَرَصِ وَالْجُنُوْنِ وَالْجُذَامِ وَمِنْ سَيِّئِ الْأَسْقَامِ

Allaahumma inni a‛oodhu bika minal-barasi, wal-jununi, wal-judhami, wa min sayyi'il-asqam

O Allah, I seek refuge in Thee from leprosy, madness, elephantiasis, and evil diseases.

Reference: Sahih. Abu Dawud: 1554