The Green Slime (DMG, p105) is a dungeon hazard, and
any effect that cures disease [...] destroys a patch of green slime.
A Paladin, from level 3, is immune to disease thanks to the Divine Health feature. Does that mean that, if a Green Slime drops on one, it is destroyed? Or would the slime only be destroyed by some restoration spell that said it cured a disease?