Chigger Dermatitis
Introduction
Introduction to dermatitis is also known as sand and sand , and foreign countries are called red or . It is an arachnid, a scorpion, a scorpion. In the four periods of life history, eggs, larvae, larvae and adults, the adults lay eggs in the gaps of the soil, hatching into larvae after 5-7 days, parasitizing on rodent small animals, and sucking blood once into the soil as a nymph. (Nymphids), after two times of molting to adult, the average life span of adults is about 300 days. Tropiculosis (Trombiculosis) Because the saliva of the larvae can dissolve the subcutaneous tissue of the host, it is itchy and red pimples, and then forms blisters, which then form dark brown eschar, which forms a shallow ulcer after eschar . basic knowledge The proportion of illness: the incidence rate is about 0.01%-0.02% Susceptible people: no special people Mode of infection: non-infectious Complications: typhus
Cause
Cause of dermatitis
(1) Causes of the disease
The adult and nymphs of the cockroach do not suck blood. They feed on the eggs and plant juices of other animals. They live in the shrubs of damp and grassy shades. Only the larvae suck blood. The larvae are parasitic on mammals and birds, and reptiles. Amphibians, sometimes invading people.
(two) pathogenesis
When the host stays in the breeding ground, the larva is attracted to the host by the smell of the host. The larvae are then pierced into the skin and then injected into the saliva. The host's tissue fluid, lymph and blood are taken, and the parts are not replaced and replaced during blood-sucking. The host can stay in the host for 40-72 hours, and also for up to 10 days.
The range of activity of cockroaches is small, and is affected by factors such as temperature, humidity, light, and airflow. The larvae are sensitive to the host's breathing, smell, body temperature and color.
Prevention
Dermatitis prevention
Carry out a patriotic health campaign centered on the elimination of disease and disease, remove weeds, block rat holes, kill mice, and sprinkle 0.5% -666 solution or 0.2% dichlorvos on the weeds along the stream. Hey.
Complication
Dermatitis complications Complications typhus
Jungle typhus.
Symptom
Symptoms of ecdysis Symptoms Common symptoms Itching pimples, excessive thickening of the stratum corneum, redness, secondary infection, scarring, high heat wheal , nausea pustules
The symptoms after biting are closely related to the type of sputum, the clothing of the person and the sensitivity of the body. Some symptoms are obvious, some are not obvious, the skin is itchy and burning after biting, and the soybeans appear locally. To the large edematous erythema of broad beans, there are bites of sputum in the center, and some may have large redness or blisters and systemic wheal. After the blister breaks, it reveals a bright red smashed surface, often secondary to infection.
Aphids most often bite the calf, waist, posterior hair, auricle, groin, external genitalia, anus, etc., followed by head and neck, chest, abdomen, sputum larvae bite the skin in addition to causing skin damage, but also cause mites heat, Also known as tsutsugamushi disease or scrub typhus, it is caused by rickettsia brought by larvae.
At the initial stage, there is a red papule that does not itch at the bite. There is a small blisters or pustules at the top, which gradually increases to the soybeans. After 1 to 2 days, the top necrosis is called eschar, which is characteristic, surrounded by redness and sputum. There is a small ulcer but no suppuration. There is tenderness in the nearby lymph nodes. After 1 to 2 days, the patient suddenly has high fever, chills, dizziness, nausea, sore limbs, and lethargy.
Examine
Examination of dermatitis
There is no specific laboratory examination for this disease, and the main routine dermatological examination. Blood routine can be done if necessary: blood neutrophils rise, and eosinophils can also increase.
Diagnosis
Diagnosis and differentiation of dermatitis
diagnosis
According to clinical manifestations, the characteristics of rash can be diagnosed in summer and autumn.
Differential diagnosis
The disease should be identified with the following diseases:
Papular urticaria: The rash suddenly occurs, showing a wheal-like papule, which has little to do with the season. It does not necessarily have a history of contact with grains and weeds, and it is not easy to detect the worms.
Hemorrhoids: Itching is severe, especially at night, there are typical areas of good hair, and it is often found in thin skin lesions such as finger joints, wrists, and underarms.
Chickenpox: The incidence is mostly in the spring, more common in children, with a history of contact infection, rash is mainly vesicular, centripetal distribution, erythema, papules, herpes, blister and scars can be seen, can involve mucous membranes, often before rash There are systemic symptoms such as fever and fatigue, and there is no history of exposure to cereals or weeds.
