There are times when Arizona feels like the Australia of the American Southwest. Venomous scorpions, snakes, and lizards, spikey plants, and, to top it off, we have beetles that can burn your skin! On the plus side, the “master blister beetle,” also known as Lytta magister, is easy to spot.

Usually, two to three inches long, these beetles have a nice mix of black and orange. If you do find it, it is likely to be in the spring when the brittlebush, a very common desert shrub, is in bloom. Several dozen beetles may hang from the flower stalks of a bush temporarily, hosting a small band of beetles.

When you find master blister beetles, you are unlikely to pick up big, black, and orange ones. The name “blister” refers to the beetle’s ability to pop a blood vessel in a leg’s joint, causing yellowish blood to ooze out. Beetles only do this when they are upset. Not only does the blood smell terrible, but it’s also dangerous, causing painful blisters on the skin. It contains cantharidin, a chemical classified as “super-toxic.” When a bird or mouse tries to eat a master blister beetle, it will get a mouthful of disgusting blood, which might make the animal think twice.

Because master blister beetles are chemically protected from their enemies, they can afford to be so conspicuous. Birds and other predators are warned to stay away from them because they are protected. Luckily, you don’t have to hold them in your hand to enjoy seeing them in their brittlebush groups.

How to deal with beetle burns

Blister beetle blood can cause swelling and painful blisters within 24 hours. Do not panic if you come into contact with one of these bugs. In about a week, the welts and blisters will heal.

The area should be washed daily with warm soapy water and treated with a topical steroid or antibiotic. The swelling and pain can also be eased by applying a cold compress. If the toxin gets into your eyes, seek medical attention.

Clothing in contact with blister beetles should also be washed since their blood can soak into the material.

Protecting yourself from burns

Beetles grow so large and sport bright colors because of their toxic blood. These big bugs are not to be messed with by predators! When you play or hike outside, keep an eye out for blister beetles. Their size and coloration make them easy to spot, so give them a wide berth. Blister beetles can be gently removed by blowing them off your skin. Then, rinse the area with water once the beetle is gone.

Keep your eyes on the trails, and enjoy these beetles from a distance!

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