Skin myiasis

Introduction to skin myiasis Skin worm (Cutanenousmyiasis) is an inflammatory reaction caused by the entry of certain fly larvae into the human skin. This disease is more common in pastoral areas, and is reported in Qinghai, Tibet, Inner Mongolia, Northeast China and North China. The source of myiasis is a parasitic disease of livestock such as cattle and horses, and can also be infected with humans. The maggots directly lay eggs on human skin or hair and clothing. When the eggs hatch into larvae, they can penetrate into the skin and cause subcutaneous myiasis. Before the appearance of skin lesions, the patient often feels general malaise and manifests as bloated. Both types of skin damage. basic knowledge The proportion of illness: this disease is rare, the incidence rate is about 0.0005% - 0.0007% Susceptible people: no special people Mode of infection: non-infectious Complications: sepsis

Cause of skin fly plague

(1) Causes of the disease

The source of myiasis is a parasitic disease of livestock such as cattle and horses. It can also be infected with humans. There are many kinds of flies causing this disease. The Chinese literature contains the bovine flies (Qinghai) and the skin flies (Shenyang, Inner Mongolia Autonomous Region). ), Chen's family fly (Inner Mongolia Autonomous Region) and so on.

According to the different parasitic parts, it can be divided into: intestinal myiasis; eye, ear, nose, oral myiasis; larvae; vaginal and urethral myiasis; skin fly plague.

Environmental factors (85%)

The maggots directly lay eggs on human skin or hair, and on the clothes, when the eggs hatch into larvae, they can penetrate into the skin and cause subcutaneous myiasis. When a fly sucks human blood through a certain mosquito, it enters the skin (such as the human skin fly) from the wound of the hedgehog. Directly spawning in skin wounds or skin ulcers, living in decaying tissues (such as horse flies, flies), known as traumatic myiasis.

This section focuses on subcutaneous myiasis caused by bovine or flies.

(two) pathogenesis

The maggots lay eggs directly on the skin or hair of the human body. On the clothes, when the eggs hatch into larvae, they can penetrate into the skin, causing subcutaneous myiasis. When the flies suck the human blood through some kind of mosquitoes, they enter the skin from the wounds of the hedgehogs. (such as human skin fly), direct spawning in skin wounds or skin ulcers, causing disease.

Skin fly plague prevention

The disease is usually associated with the development of mosquito and fly infections, so the elimination of mosquitoes and flies is of great significance for the treatment of this disease, reducing the chance of breeding eggs. Do a good job in the cowshed and horse stables, do a good job of killing and killing flies, eliminate mature larvae, and prevent adult fly. After the work of the cowshed, the body should be cleaned. For patients with wounds on the skin, local disinfection and dressing should be taken to reduce the chance of infection. At the same time, bathe should be taken frequently to make personal hygiene.

Skin myiasis complications Complications sepsis

Skin muscivious disease mainly causes local skin infection, and adjacent tissues can be swallowed by larvae to form ulcers. If not treated in time, the ulcer surface can be progressively enlarged. Therefore, this disease can be caused by skin integrity damage caused by skin damage, usually secondary to low body, or long-term use of immunosuppressants and fungal infections such as nail fungus, such as concurrent bacterial infections may have fever, skin swelling, Destruction and purulent secretion flow out and other performances. Severe cases can lead to sepsis, which should be brought to the attention of clinicians.

Symptoms of skin myiasis Common symptoms Creepy nausea, itching, swelling, dizziness, granuloma, fatigue, limbs, numbness, insomnia

Before the appearance of skin lesions, patients often feel general malaise, such as mild fever, headache, dizziness, nausea, burnout, insomnia, numbness of the limbs, local skin burning, itching.

Burst type

After a few months of infection, the skin appears to be about the size of apricot kernels, which is higher than the skin's migratory wind-like normal skin color or red mass, deep into the skin, the mass gradually increases, the itching can be aggravated, and the worm feels motility. It can be moved. After about one to several days, the damage increases, the swelling increases, and the purple-red bloody vesicles appear in the center. After the rupture, the larvae (sputum) and a small amount of yellow mucus or pus can be discharged. After about 2 to 3 days, the inflammation gradually recedes. After the scar, the scars are usually more common in the skin, the number can vary, can be as many as ten, often in batches, occurs in the shoulders, chest, abdomen, waist, buttocks, etc., can also be seen in the eyelids or Near the lips, it often rises and falls, and after one place, he appears again.

2. Minhang type

The skin has a tortuous line of redness and swelling, and the end is a blisters. This is a symbol of larval activity, and the larvae are in front of the blister.

Skin fly plague

The laboratory tests required for this disease mainly include: blood routine examination results show that eosinophil counts are significantly increased, up to 10% to 40%, and erythrocyte sedimentation rate is accelerated.

Histopathological manifestations of the disease: Case detection showed eosinophilic granuloma, localized eosinophil infiltration in the dermis, and sometimes visible worm body section.

Diagnosis and identification of skin myiasis

The disease can be diagnosed according to clinical manifestations, epidemiological characteristics, and blood test results according to laboratory tests. Eosinophil counts are significantly increased, erythrocyte sedimentation rate is accelerated, and eosinophilic granuloma is formed according to histopathology. There are limitations in the dermis. Eosinophil infiltration, sometimes visible in the body section, can make a diagnosis.

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