Acid Glob

You spit a glob of acid towards a creature within 30 feet of you. The target must succeed a Dexterity saving throw or be hit by the glob, taking 2d4 acid damage. The target takes an additional 2d4 acid damage at the start of each of its turns until the spell ends or it uses its action to remove the acid. 

At Higher Levels. When casting this spell using a spell slot of 2nd level or higher, this spell deals an additional 1d4 damage on a failed save and on all subsequent instances of damage for each slot level above 1st.