If you’ve spent any time in Cambodia during the rainy season, you might have heard of the “tomrong” or Rove Beetle. While they don’t bite or sting, these tiny insects are famous for causing painful, blistery skin rashes that look like a burn.
Here is everything you need to know about staying safe and treating “Rove Beetle Dermatitis.”
What is a Rove Beetle?
Despite their name, they look more like elongated ants than typical beetles. They are usually 7–10mm long with distinct orange and black stripes.
In Cambodia, they are most active during the monsoon season (May to October). They live in agricultural fields and wetlands but are highly attracted to bright white fluorescent lights at night, which is how they end up in our homes and bedrooms.
Why do they cause “burns”?
The Rove Beetle doesn’t have a stinger. Instead, its body contains a potent toxin called Pederin.
- The Trigger: The toxin is released only when the beetle is crushed or squeezed against the skin.
- The Reaction: Within 12–24 hours, the skin develops a red, itchy rash that often turns into painful blisters.
- The “Kissing Lesion”: If you get the toxin on an elbow or knee crease and then bend it, the toxin spreads to the opposite side, creating a “mirror image” rash.
Do’s and Don’ts: Prevention and Treatment
| DO | DON’T |
| Blow them off: If one lands on you, gently blow it away or flick it off with a piece of paper. | Don’t crush them: Never slap or squish a beetle on your skin. |
| Wash immediately: If you think you’ve touched one, wash the area with soap and water instantly. | Don’t scratch: Breaking the blisters can lead to a secondary bacterial infection. |
| Minimize light: Use warm/yellow lights or turn off outdoor lights near entrances at night. | Don’t ignore it: If the rash spreads to your eyes, seek medical help immediately. |
How to Treat a “Rove Beetle Burn”
If you’ve already been “burned,” don’t panic. Most cases can be managed at home:
- Cold Compresses: Use a cool, wet cloth to soothe the burning sensation.
- Antiseptics: Clean the area with an antiseptic (like Betadine) to prevent infection.
- Soothing Creams: Mild topical steroids (prescribed by a pharmacist or a doctor) or calamine lotion can help with itching.
- Keep it Dry: Once blisters form, try to keep them clean and dry.
Note: If the rash is on your face, near your eyes, or covers a large part of your body, visit a clinic.
Stay vigilant, keep the lights low during the rainy months, and remember: Blow, don’t slap!
