Blister Beetle
Pictures

A blister beetle sitting on a plant. Blister beetles cause painful blisters when a person comes into contact with the caustic substance that they secrete when threatened.

Poisonous blister beetles with bright black and red warning coloration. They are some of the most colorful beetles.

If you see the blister beetle, refrain from touching it; this insect shouldn't be handled.

Blister Beetle on a chamomile flower

Blister from a blister beetle on a person's arm. The blister is caused by a caustic substance secreted from the joints of the body of the beetle when threatened.