Alastor's Sanguine Semblance

The caster takes a drop of blood provided by the target and proceeds to paint along the person's body. Everywhere the caster draws with the blood they paint an illusion of wounds upon the body, the thicker they paint the deeper the wounds. 

If a creature uses its action to examine the wounds, the creature can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. If a creature discerns the illusion for what it is, the illusion becomes faint to the creature.