Du'a for all serious illnesses

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 leukoderma, insanity, leprosy, and from evil diseases.

Sunan Abī Dāwūd 1554