Insect bite dermatitis
Introduction
Introduction to insect bite dermatitis Insect bitedermatitis refers to the inflammatory skin disease caused by insect bites on human skin. Insect bite dermatitis can also be called "papular urticaria", which is mainly related to the bite of arthropods. Commonly, such as cockroaches, in spring, More common in summer and autumn, due to differences in insect species and differences in body reactivity, it can cause different skin reactions at the bite. Generally red edematous papules, small blisters in the center, soy size, occur in exposed areas and lumbar circumference. basic knowledge The proportion of illness: 0.013% Susceptible people: no specific people Mode of infection: non-infectious Complications: acute lymphangitis
Cause
Cause of insect bite dermatitis
Insect bites (40%):
Common insects that cause dermatitis include mosquitoes, bedbugs, cockroaches, cockroaches, cockroaches (small black worms), wasps, etc., and some caterpillars, such as mulberry caterpillars and thorns of thorns, can cause diseases. Due to the difference in the types of human bites and the differences in the physical condition of the bite, the bite will present a different skin reaction. Generally manifested as edematous papules, wheal, edematous erythema, papules, herpes, bruises, etc., accompanied by varying degrees of itching, tingling, burning pain.
Contact with venom venom (40%):
The human skin is exposed to its venom, or to the venom of the worm's body. The sinister poison invades the skin and is caused by the fight with the blood. Regardless of the type of rash, traces of insect bites or bee stings and poisonous hair can be found in the center of the affected area. Bee stings, poisonous hairs should be removed as much as possible, and venom should be aspirated. Insect bite dermatitis caused by sputum and sputum, bathe before treatment and replace clean clothes.
Prevention
Insect bite dermatitis prevention
First, do a good job in the environment, living room and personal hygiene to prevent the breeding of insects that cause this disease.
2. Insecticides can be sprayed indoors and outdoors to eliminate harmful arthropods such as bed bugs, fleas and mosquitoes.
Third, if you have been ill, you can take chlorpheniramine, diphenhydramine, etc., you can also take Chinese medicine Chujiaohuadu pill, Saijinhua poison powder, pediatric fragrant orange pills, etc., you can apply white lotion or insect bite And other antipruritic agents. If there is secondary infection or long-term unhealed, you should go to the hospital for treatment.
Fourth, diet avoid spicy stimulation, alcohol, seafood, hair, beef and goat meat. If you have allergies to cosmetics during taking, you should use cosmetics carefully to avoid irritating the skin. Sensitive skin is easy to dry and peel, pay attention to hydrating the skin and keep moist.
Complication
Insect bite dermatitis complications Complications acute lymphangitis
Can be secondary infection or local lymphangitis.
Symptom
Insect dermatitis symptoms Common symptoms Mosquito bites inflammation Pimples wheal
1. Skin lesions are red edematous rashes with a fusiform shape from soybean to peanut. Like a windy group, there may be blisters in the center, and some highly sensitive people may have tension bullae. The rash appears in batches, clustered and less fused.
2. Skin lesions are more common in the limbs, lower back, and buttocks.
3. There are many cases in spring and summer.
4. Conscious symptoms are severely itchy and generally have no systemic symptoms. Due to intense scratching, infection can occur secondary to fever. The rash subsides after 3 to 7 days, leaving temporary pigmentation.
Examine
Insect bite dermatitis
It can be diagnosed according to the dermatological examination and the history of insect bites, and the blood routine can also be checked. Blood routine is the most common and basic blood test. Blood consists of two major parts, fluid and tangible cells, which are routinely tested for blood. Blood has three different functions of cells - red blood cells (commonly known as red blood cells), white blood cells (commonly known as white blood cells), and platelets. The disease is judged by observing the quantitative change and the morphological distribution. It is one of the commonly used auxiliary examination methods for doctors to diagnose the disease.
Diagnosis
Diagnosis and identification of insect bite dermatitis
diagnosis
First, the season of good hair: good hair in summer and autumn.
Second, the good hair parts: exposed parts.
Third, the characteristics of rash: local redness, papules, wheal or silt, blisters and bullae on the surface, visible bite marks in the center of the lesion.
Fourth, the symptoms: stinging, burning, itching.
5. Histopathology: lymphocytes in the superficial and deep perivascular and collagen fibers, tissue cells and eosinophils infiltration, finite local epithelial squamous cell edema and dermal papillary edema, severe epidermis or epidermal blister .
Differential diagnosis
First, the locust dermatitis bite after the local appearance of sputum and soybean sized wind group, itching, individual blistering, and even cause papular urticaria.
Second, the mites dermatitis corn size to the size of the red bean herpes; or purple red swelling or wheal, sometimes visible traces of insect bites.
Third, the cryptic dermatitis skin lesions are linear or strip-like redness, with dense papules, blisters or pustules, consciously burning, pain.
4. The skin lesions of mulberry caterpillar dermatitis are red porcine mounds of mung bean to soybean size, and herpes or wheal.
5. Pine caterpillar dermatitis skin lesions are rashes, wheals, papules, blisters, pustules, subcutaneous nodules, etc. Many patients have joint swelling and pain, but there is no bacterial growth in pus culture.
