Found on the tire of my car. It’s about an inch long. What is this? (Page 1 ) | October 26, 2025

Puss moth caterpillars rarely cause serious damage to trees; however they can pose a health hazard to children and gardeners. Intense, throbbing pain develops immediately or within five minutes of contact with the caterpillar. Stings on the arm may also result in pain in the axillary (armpit) region. Erythematous (blood-colored) spots may appear at the site of the sting. Other symptoms include headaches, nausea, vomiting, lymphadenopathy, lymphadenitis, and sometimes shock or respiratory stress. Pain usually subsides within an hour and spots disappear in a day or so.

Weird venomous caterpillars that look like walking toupées are invading Virginia

This pus caterpillar looks like a harmless little toupee but it’s way more dangerous than that. (Image credit: Virginia Department of Forestry)

A bizarre little insect that looks like a walking toupée and squirts venomous pus from knifelike spines is terrorizing Virginia this year, according to the state’s Department of Forestry (VDoF).

The venomous pus caterpillar is the larval form of the southern flannel moth (Megalopyge opercularis), and if you see one you should stay away from it. Its “hairs” are actually spines that make it among the most venomous caterpillars in the United States. A woman in New Kent County described the sensation of a “scorching hot knife passing through the outside of my calf” when she brushed against one on the door of her car, according to The Daily Progress.

Pus caterpillars have appeared in Virginia before, according to the VDoF. And they’ve been found as far north as New Jersey. But they’re much more common in Florida and at greatest abundance in west-central Texas, according to the University of Florida. Eric Day, manager of Virginia Tech’s Insect Identification Lab, told The Daily Progress that this appears to be “an outbreak year.”