Deep Magic Volume 2 (p.208)
Plague Marks
0-level (Cantrip) Necromancy
Casting Time: 1 action
Range/Area: Touch
Components: Verbal, Somatic, Material
Materials: a pair of fly wings
Duration: 1 hour
Damage/Effect: Social
You place the fly wings in the mouth of an intact corpse that has been dead no more than 24 hours. The visible signs of a disease of your choice manifest on the body. These signs are temporary and not contagious, but they appear genuine under the scrutiny of anyone not practiced in diagnosing diseases.
Available for: Bard, Warlock, Wizard