DefinitionMillipedes are worm-like bugs called arthropods. Certain types of millipedes release a harmful substance (toxin) if they are threatened or if you handle them roughly. Millipedes can squirt toxin several inches that may cause allergic reactions in some people.This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.Poisonous IngredientHydrochloric acid (in some millipedes)Where FoundMillipedesSymptomsIf the millipede toxin gets on the skin, symptoms may include:Staining of the skin (turns brown)Intense burning or itching of skinBlistersIf the millipede toxin gets in the eyes, symptoms may include