اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْبَرَصِ وَالْجُنُونِ وَالْجُذَامِ وَمِنْ سَيِّئِ الْأَسْقَامِ
Allahumma inni a'udhu bika minal-barasi wal-jununi wal-judhami wa min sayyi'il-asqam
O Allah, I seek refuge in You from leprosy, insanity, elephantiasis, and evil diseases.
Recite regularly for protection from severe diseases
The Prophet (PBUH) would seek refuge from these severe and incurable diseases.