Three-Lined Beetle Rash Mistaken for Shingles, Experts Warn

Skin lesions resembling burns and blisters can be mistaken for shingles, but they are often caused by the three-lined beetle, a common insect in Vietnam. This misdiagnosis leads many to use folk remedies or inappropriate treatments, worsening the condition and potentially causing infection and scarring.

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The three-lined beetle does not bite or sting. Skin damage occurs when people come into contact with a toxin called Pederin, found in the insect's body.

According to Dr. Nguyen Huu Truong, Deputy Director of the Center for Allergy and Clinical Immunology at Bach Mai Hospital, the three-lined beetle does not bite or sting. Instead, skin damage occurs when people come into contact with a toxin called Pederin, found in the insect's body. Pederin is a potent irritant that causes severe dermatitis.

These beetles often fly into homes seeking light, especially during harvest season or after storms. When people see them crawling on their skin, their natural reaction is to swat or crush them. This action releases Pederin, which directly contacts the skin. The toxin can also transfer to hands and then spread to the face, eyes, or other body parts.

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This action releases Pederin, which directly contacts the skin. The toxin can also transfer to hands and then spread to the face, eyes, or other body parts.

Dr. Truong warns that self-treating these lesions with antiviral drugs meant for shingles is ineffective. Furthermore, applying folk remedies like plant leaves can damage the skin's protective barrier, creating an entry point for bacteria, leading to infection, necrosis, and permanent scars. The correct first step after contact is to gently remove the beetle by blowing it away or using paper, then immediately wash the affected area thoroughly with water.

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Self-treating these lesions with antiviral drugs meant for shingles is ineffective. Furthermore, applying folk remedies like plant leaves can damage the skin's protective barrier, creating an entry point for bacteria, leading to infection, necrosis, and permanent scars.