What's going on with itchy skin and red bumps? What's the matter with itchy skin all over the body?

In autumn, due to the dry weather, our skin will have some itching symptoms. This is normal seasonal dry skin itching, but if it is itching for a long time and the skin is scratched If there are many damages, then you need to consider whether there is a skin disease. Why is it that the itchy skin is covered with red bumps? Let’s take a look!

1. Causes of itchy skin

If the skin itches and red bumps appear and the more you scratch it, it is mainly considered to be urticaria caused by allergies. Urticaria, commonly known as wheals, is a local skin edema reaction caused by the dilation and increased permeability of small blood vessels in the skin and mucous membranes. Clinically, it usually presents as wheals of different sizes, with sudden onset, rapid onset, rapid resolution, severe itching, and no trace after recovery.

2. Cholinergic urticaria

If the skin itches and red bumps appear more and more, it may be caused by cholinergic urticaria in urticaria. Cholinergic urticaria is also called papular urticaria or generalized thermal urticaria. It is more common in young people. In most cases, the body temperature will increase due to exercise, heat, emotional stress, scratching, eating hot drinks or alcoholic beverages. Rising and other triggering factors can stimulate the nerve center and cause the appearance of urticaria.

Symptoms and characteristics of cholinergic urticaria

The skin lesions of cholinergic urticaria are characterized by small wheals of 1-3mm, with redness around them, and are scattered and distributed, about 1-3mm in diameter. 1/3 of the cases are accompanied by symptoms such as headache, perioral edema, tearing, eye swelling and pain, salivation, nausea, vomiting, abdominal pain, etc. A few patients may also experience dizziness, hypotension, asthma attacks, etc. Generally speaking, the condition will pass through It gradually improved after several years.

3. Contact urticaria

If the skin itches and red bumps appear more and more, it may not only be caused by cholinergic urticaria, but also contact urticaria. caused. The so-called contact urticaria is a skin reaction in which wheals and erythema occur after the skin comes into contact with certain allergens. Its pathogenesis is mainly caused by the direct stimulation of mast cells by contact substances to release histamine, slow-reacting substances, bradykinin, etc. reaction.

Symptoms and 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, on the calves within 2 hours. It can be limited to the contact part during the visit, or it can cause erythema and itching all over the body due to scratching, irritation and other factors;

Immune contact urticaria generally has no systemic symptoms and is mainly caused by various allergens, such as asthma, rhinitis, gastrointestinal tract and mouth and throat dysfunction.

4. Causes of skin allergies

1. Pollen: During the pollen spreading season, tiny pollen particles will be scattered in the air during the spreading process, and will spread with the flow of the air. Flying around, some of it will be inhaled and absorbed through the skin.

2. Dust: Dust allergy is an allergic reaction to microorganisms living in dust and is the most common allergy. Dust allergies include cotton fibers, fur and various fibers, animal fur, etc.

3. Cosmetics: The most typical cosmetic allergy is fragrance allergy, and cosmetics containing alcohol such as astringents can also cause certain irritation to the skin. Others such as biochemical preservatives, fruit acids, etc. will cause different irritations to different skins.

4. Food: Seafood, mangoes, and nuts are the most common foods that can cause allergies.

5. Drugs: Penicillin, sulfa drugs, etc. may cause skin allergies.

6. Age: Perhaps aging is an important reason for skin sensitivity. Some people's skin was not sensitive a few years ago, but it has become sensitive in recent years. This is because there is a weakly acidic sebum film on the surface of young and healthy skin to retain moisture and protect the skin from external aggression. However, as we age, this sebum film is not as healthy as before, so some sensitive substances are easily Invasion of skin.

7. Pets: Sensitive skin can easily cause allergies due to the fur of domestic pets. The main cause of this kind of pet allergy is the protein secreted by the oil glands of cats and dogs. When pets lick their fur, these proteins stick to the fur, and then scatter into the air and attach to people. caused on the skin.

8. Seasonal changes: Due to various environmental factors, allergenic substances such as bacterial spores and pollen scattered in the air will release a large amount of histamine, a compound that is found in almost all tissues of the human body, causing facial skin allergies.

9. Temperature changes: The temperature changes from cold to hot, making the faces of sensitive people red and hot.

10. Facial skin allergies caused by ultraviolet radiation: Facial skin allergies cause some women to experience itching, rashes and scales, peeling, dryness, itching, and erythema all over the body. Allergies such as facial redness and whiteness, mottled appearance, etc. In severe cases, allergic facial redness may even occur.