1, itchy skin causes
If the skin itchy red bumps and the more you scratch the more the main consideration is due to allergies caused by hives. Urticaria is commonly known as rubella block, is yo with the skin, mucous membrane small blood vessel dilation and permeability increase and appear a local skin edema reaction. Clinically, it is usually manifested as rubella lumps of different sizes, the onset of sudden, rapid, fast fading, intense itching, healing without any trace.
2, cholestatic urticaria
If the itchy skin red bumps also more and more scratching, you can consider is due to urticaria in the cholestatic urticaria caused. Cholestatic urticaria, also known as urticaria papularis or generalized thermal urticaria, is most common in young people, most cases will be due to exercise, heat, emotional stress, scratching, eating hot drinks or alcoholic beverages to make the temperature rise in the body and other triggering factors to stimulate the nerve center, resulting in the emergence of urticaria.
Characteristics of cholestatic urticaria
Cholestatic urticaria lesions are characterized by 1-3mm small air pockets, surrounded by a red halo, sparsely distributed, about 1/3 of the slow and accompanied by headache, perioral edema, tearing, ocular distension, salivation, nausea, vomiting, abdominal pain and other symptoms, a small number of patients may also experience vertigo, low blood pressure, asthma attacks and other phenomena, in general. It takes several years for the disease to gradually improve.
3, contact urticaria
If the skin itching red bumps more and more in addition to the cholestatic urticaria, but also may be due to contact urticaria caused. The so-called contact urticaria is due to the skin contact with certain allergens after the occurrence of the skin reaction, erythema, its pathogenesis is mainly due to the direct stimulation of the contact material mast cells release histamine, slow response substances, bradykinin and other reactions caused by the contact material.
Characteristics of contact urticaria
Contact urticaria is mainly divided into immune contact urticaria and non-immune urticaria. Non-immune urticaria usually reacts within 45 minutes and calves within 2 hours, and can be limited to the contact part at the time of outpatient visit, or can lead to a generalized red rash and itching due to other factors such as scratching and irritation;
Immunologic contact urticaria usually has no systemic symptoms, and is primarily a symptom caused by a variety of allergens, such as asthma, rhinitis, gastrointestinal tract, and oro-pharyngeal dysfunction, and other symptoms.
4, skin allergy causes
1, pollen: in the pollen spreading season, tiny pollen particles in the process of spreading will be dispersed in the air, and with the flow of the air and fluttering around, and part of which will be inhaled at the same time absorbed by the skin.
2, dust: dust allergy is an allergic reaction to microorganisms that live in dust, and is the most common allergy. Dust allergy includes cotton fiber, fur and various fibers, animal fur and so on.
3, cosmetics: the most typical cosmetic allergy is fragrance allergy, and astringent water and other cosmetics containing alcohol ingredients will also have a certain skin irritation. Others such as biochemical preservatives, fruit acids and so on will cause different stimulation to different skin.
4, food: common is seafood, mango, nuts food will cause allergies.
5, drugs: penicillin, sulfonamide drugs, etc., can trigger skin allergies.
6, age: perhaps age is an important reason for skin sensitivity. Some people's skin is not sensitive some years ago, but in the past few years has become sensitive. This is because the surface of young healthy skin has a weak acidic sebaceous membrane to maintain moisture to protect the skin from external aggression, but with age, this layer of sebaceous membrane is not as healthy as it used to be, so that some of the sensitive substances are easy to invade the skin.
7, pets: sensitive skin is very easy to domestic pets fur and other allergies. This allergy due to pets is mainly due to the oil glands on the body of cats and dogs and other proteins secreted, when the pets lick the hair, these proteins are stained to the fur, and then scattered into the air, and then attached to the human skin caused by.
8, seasonal changes: due to a variety of environmental factors, the air dispersed bacterial spores and pollen and other allergenic substances will be a large number of compounds released almost all over the body's tissues - histamine, caused by facial skin allergies
9, temperature changes: the temperature fluctuates from hot to cold, so that the sensitive people face red, hot. The first time I saw this is when I was a little girl, and I was a little girl.
10, ultraviolet radiation caused by facial skin allergies: facial skin allergies cause some women, there will be a whole body skin itchy, rash and scaly, peeling, dry, itchy, red spots. Facial red and white, mottled and other allergies, and even produce allergic facial redness in severe cases.