Toxic Secretion

You naturally secrete a thin, toxic goop. It does not affect items that you might hold in your hand

Creatures that come in contact with you take 1d4 acid damage and continue to do so every turn they continue to stay in contact with you. 

In addition, you are immune to acid damage. 

if you wish to apply your secretion to a weapon such as a sword, dagger, arrow, etc. you can take a bonus action to add 1d4 acid damage to your next damage roll with said weapon.