Touch of Filth 2014

You envelop your hand in a vile miasma. Make a melee spell attack against a creature within your reach. On a hit, the target takes 1d6 poison damage and is poisoned. At the end of each of its turns, it can make a Constitution saving throw, ending the poison on a success. Until the spell ends, you can make this attack again on each of your turns as an action.

When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.