Infestation of Maggots

You touch your foe with the dust of dead flies on your fingers, giving birth to hundreds of writhing maggots in his flesh.

(Spell Compendium, p. 123)  
Originally posted on D&D tools

Necromancy

Level: Druid 3,
Components: V, S, M,
Casting Time: 1 standard action
Range: Touch
Target: Creature touched
Duration: 1 round/2 levels
Saving Throw: Fortitude negates
Spell Resistance: Yes

With a successful melee touch attack, you infest a creature with maggotlike creatures. If the touched creature fails a Fortitude saving throw, the magical maggots deal 1d4 points of Constitution damage each round at the beginning of your turn. The subject makes a new Fortitude save each round to negate the damage in that round and end the effect.

The infestation can be removed with a remove disease or heal spell.

Material Component: A handful of dead, dried flies.