Vesicular beetle dermatitis

Introduction to blister beetle dermatitis The blister beetle dermatitis is more common after exposure to the following three beetles. The Meloidae and Oedemeridae beetles cause skin lesions by releasing a blistering agent, cantharidin, which is abundant in beetles. The third blister-like beetle dermatitis is caused by the genus Streptomyces of the genus Staphyhinidae, which contains another blistering agent, scorpion toxin. These beetles do not bite the human body. Only when they stay on the human skin, when the insect body is damaged or crushed, the vesicle venom in the body flows out to contaminate the skin, causing local skin inflammation. A slight burning sensation occurs in a few minutes and develops into multiple blisters in a single day, often in a linear arrangement. basic knowledge The proportion of illness: 0.006%-0.009% Susceptible people: no special people Mode of infection: non-infectious Complications: headache

The cause of blister beetle dermatitis

(1) Causes of the disease

Human contact with the Meloidae and Oedemeridae beetles causes skin lesions by releasing a blistering agent, cantharidin, which is abundant in beetles; the third blistering beetle dermatitis is caused by stag beetles The stag beetle of the family (staphyhinidae), which contains another blistering agent, scorpion toxin, only when they stay on the surface of the human body, due to the damage of the worm body, when crushed, the venom of the vesicle in the body is effluent. The skin causes a local skin inflammatory response.

(two) pathogenesis

After exposure to the MeloidAe and Oedemeridae beetles, the scorpion toxin contaminates the skin, causing local skin inflammatory reactions. It will develop a slight burning sensation in a few minutes, and will develop into multiple blister in one day, often arranged in a line. .

Blisters beetle dermatitis prevention

Avoid the cold in the grass under the trees in the summer night. When the beetles fall on the skin, do not shoot the dead insects directly. You can drop the insects to the ground and use the screen doors and screens to prevent the beetles from invading.

Complications of blister beetle dermatitis Complications

Heavier reactions may be associated with systemic symptoms such as fever and headache.

Symptoms of blister beetle cutaneous common symptoms pustular edema itching pruritus

More common in the summer, it occurs in the exposed parts of the face, neck, limbs, etc. After the beetle falls on the human skin, the edematous erythema appears immediately due to the tapping of the worm, followed by papules, blisters, pustules within a few hours to 1-2 days. They are often arranged in a line, varying in length, and there may be scattered papules, blisters, conscious itch, burning pain in the periphery of the strip.

Examination of blister beetle dermatitis

According to the dermatological examination and the history of insect bites, it can be diagnosed:

1. The typical skin lesions are mung beans or slightly reddish papules, which are hard in nature, often have blister on the top, crusted after smashing, and have a spindle-shaped blush around them. After being scratched, they show a wind squad, and the squad still returns to its original shape after it has subsided. Occurs in the trunk and the proximal extremities.

2. The number of damages is variable, appearing in batches, scattered or a few clusters, often accompanied by gastrointestinal disorders, and a small number of patients sometimes have vesicles. The length of the disease varies, and it usually fades off in about 1 week.

Diagnosis and identification of blister beetle dermatitis

According to the clinical manifestations and the onset of the disease, the site of the disease can be diagnosed.

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