Corrosive Skin

You touch a creature, infecting them with a flesh-eating magical disease that corrodes their skin. Make a melee spell attack, on a hit afflicting the target with this curse. At the start of each of the creature's turns, it must succeed on a Constitution saving throw or suffer 1d8 necrotic damage. Additionally, the creature cannot be affected by any healing magic for the duration. The curse may be ended early with a remove curse spell or other similar effect.