papular urticaria
Introduction
Introduction to papular urticaria Papular urticaria is also known as urticaria moss, baby moss. It is a common allergic skin disease in infants and children, but it can also be caused by adults. Often several people in the same family are at the same time. There are more spring and autumn seasons. The disease is a disease named after the symptoms. In fact, the disease is insect bite dermatitis. The clinical features are scattered, slightly harder, papules with vesicles on the top. There is a spindle-shaped blush around the circumference, consciously itching. basic knowledge The proportion of sickness: 0.2% Susceptible people: infants and young children Mode of infection: non-infectious Complications: laryngitis myocarditis
Cause
Cause of papular urticaria
Mosquito bites (50%):
Most of the diseases are caused by allergic reactions caused by mosquitoes, bed bugs, cockroaches, cockroaches, cockroaches, cockroaches, etc. The insects penetrate the skin through the mouthparts, and the saliva and part of the mouthparts are the cause of the disease. .
Pathogenesis
The allergic reaction caused by biting is biphasic; immediate wheal sensation of the wheal is mediated by immunoglobulin E; then a more persistent papular-like reaction, the immediate erythema erythema reaction lasts shorter, and the pimples It has a long-term existence and is considered to be a delayed allergic reaction. It takes about 10 days to sensitize after the initial bite. At this time, a rash occurs after being bitten. Immunoglobulin E and complement deposition are found in the superficial vascular wall of the dermis. There are neutrophils and nuclear debris around the blood vessels, suggesting that immune complexes may be involved in the disease. In addition, some patients may be related to environmental changes, gastrointestinal disorders or food allergies.
Prevention
Papular urticaria prevention
1. Pay attention to hygiene and avoid bad stimulation.
People with a history of urticaria should pay attention to keeping clean indoors and outdoors, and keep pets such as cats and dogs at home. Avoid inhaling pollen, dust, etc. For wind, cold, dampness, fire and insecticide, it should be close and far away.
2, using Chinese medicine prevention.
Some traditional Chinese medicines, such as Shouwu, Poria, Ginseng, Astragalus, Ganoderma lucidum, Jujube, Ligustrum lucidum, Cuscuta, Schisandra, Polygonatum, Huai Yam, Codonopsis, etc., have anti-free radicals, improve immune function, promote metabolism, regulate nervous system. And a variety of functions such as the endocrine system, have obvious anti-allergic effects. Vascular expansion, stimulating or aggravating urticaria.
3, pay attention to diet, to avoid incentives.
The incidence of urticaria has a certain relationship with diet, and some foods may be the cause. For example, fish and shrimp seafood, canned foods such as artificial colors, preservatives, yeast and other artificial additives, salted foods, beverages, etc. can induce urticaria. In addition, irritating foods such as too hot and sour will also reduce the digestive function of the gastrointestinal tract, so that the food residue stays in the intestine for too long, thus producing peptone and polypeptide, increasing the probability of allergies in the human body.
Leather gloves, hair dyes, perfumed soaps and detergents, chemical fiber and wool garments can be a bad stimulus for people with allergies or urticaria and should be avoided. People who suffer from cold urticaria should not go to the beach, nor can they take a cold bath. In winter, keep warm.
4. Maintain a healthy mentality and improve your body's resistance.
The onset and exacerbation of chronic urticaria have a certain relationship with people's emotional or psychological stress.
5, pay attention to allergies caused by drug factors.
In the clinic, some drugs can cause urticaria, such as penicillin, tetracycline, chloramphenicol, streptomycin, sulfonamides, polymyxin and other antibiotics, analgin, aspirin and other antipyretic analgesics.
6. Actively treat the original disease.
Urticaria is both an independent disease and a skin manifestation of certain diseases. There are many diseases that can cause urticaria, such as infectious diseases: parasitic infections like intestinal mites, mites, etc.; bacterial infections like caries, alveolar abscess, tonsillitis, otitis media, sinusitis, etc.; viral infections like type B Hepatitis; fungal infections such as hand, foot and ankle. In addition, diabetes, hyperthyroidism, menstrual disorders, and even potential tumors in the body may cause urticaria.
Complication
Papular urticaria complications Complications laryngitis myocarditis
Complications 1. Chronic urticaria can cause complications of laryngitis. Chronic urticaria is more common with bronchitis and often involves laryngitis in the throat. General laryngitis is caused by secondary bacterial infections. When the symptoms of laryngitis are severe, it may even cause suffocation. It can be seen that the harm of chronic urticaria is still relatively large.
Complications 2, chronic urticaria can affect the cardiovascular system and bring cardiovascular system complications. Mainly manifested as fever, headache, shortness of breath, weakness of the limbs and other symptoms, sometimes suddenly subsided and then the liver increased dramatically. Some patients develop myocarditis.
Complications 3, rapid emergence of rubella lesions, local symptoms of itching or fever. Some patients have systemic symptoms such as poor diet or migraine in the rubella. Rubella flat redness or pale edematous spot lesions are also often referred to as graphic urticaria. Sometimes, hemorrhagic urticaria or bleeding often occurs in the initial onset. Blisters in the rubella block can be converted into vesicular urticaria. Sometimes, blisters or bullae occur in seemingly normal superficial skin, but blushing often occurs, and such rubella can easily induce children.
Symptom
Papular urticaria symptoms Common symptoms rash, measles, facial itching, cold, hot, papular, acne, blush, secondary infection, windy pimples
1. The disease occurs in infants and young children, more common in summer and autumn, sometimes a number of children at the same time.
2. The typical skin lesions are mung beans or slightly reddish papules, which are hard in nature, often have blisters on the top, crusted after smashing, and there is a spindle-shaped blush around them. After the smashing, the wind squad appears, and the wind squad still returns to its original shape. .
3. Occurs in the trunk and the proximal extremities, the number of lesions is variable, often appear in batches, scattered or a few clusters, often accompanied by gastrointestinal disorders, a small number of patients sometimes have blister (Figure 1).
4. The length of the disease varies, usually more than 1 week to self-resolved, leaving temporary pigmentation, but new rashes can appear one after another, so the new and old skin lesions exist at the same time, and gradually heal after the weather turns cold, but the next year is often occur.
5. Conscious violent itching, especially at night, often affects sleep, the child is mentally disturbed, and the epidermis is exfoliated after scratching, which is easy to cause secondary infection.
Examine
Examination of papular urticaria
Measles patients can be tested for erythrocyte sedimentation rate, antinuclear antibodies, serum complement assays, and skin biopsy for the diagnosis of urticaria caused by complement activation. Secondly, for cold urticaria, syphilis serum test should be carried out to test cold globulin, cold fibrinogen, cold hemolysin and ice test, anti-nuclear antibody, etc. Third, solar urticaria should be checked for feces and urinary fistula. Porphyrins, etc., should also pay attention to the difference from SLE.
Diagnosis
Diagnosis and diagnosis of papular urticaria
diagnosis
Diagnosis can be based on clinical manifestations.
Differential diagnosis
1. Urticaria sudden loss, no papules and vesicles, leaving no trace after disappearing, regardless of age, season.
2. Itching rash occurs in the extremities of the extremities, and the disease is prolonged. The skin is often infiltrated and hypertrophied due to scratching, often with inguinal lymphadenopathy.
3. The incidence of varicella and after anxious, there are prodromal symptoms, rash is erythema, papules and blisters, crusting damage exists at the same time, no wheal occurs, skin lesions are scattered in the head, face, trunk and limbs, and involving mucous membranes, itching is not With systemic symptoms, it is popular in spring.
