Worms breathe through their skin, aided by the layer of mucus that they secrete. If their skin dries out, they die. ... Worms don't bite. They also don't sting.

What type of worms bite?

Of the many species of worms, the bristleworm is one of the most dangerous. Bristleworms are elongated segmented worms. Each segment contains a pair of bristles. Although bristleworms are not aggressive, they bite when handled, and the bristles can penetrate skin (sting).

Is it safe to touch worms?

Earthworms and red wriggler worms are perfectly safe to hold bare-handed, though it's probably prudent to wash your hands before eating your next meal.