Gypsy moth larvae (i.e., caterpillars) do not bite. They do have two types of hair (called setae) that they use to defend themselves which can create a stinging sensation. Reactions to these stinging hairs vary from mild to moderately severe itching with an accompanying rash, similar to contact dermatitis.

Are gypsy moths poisonous?

But are these insects dangerous? It turns out, not really. They are more of a summertime hassle. The tiny hairs, called setae, on the caterpillar (or moth) carry histamine, which causes a red, bubbling rash.

What happens if you get stung by a gypsy moth?

Symptoms include mild to moderate stinging or pain accompanied by welts, vesicles (small, fluid-filled sacs), raised red bumps, and patches of red, scaly skin. These symptoms appear within minutes or hours after contact and last anywhere from one to several days.