What causes allergies for no reason?

I believe many people have experienced allergies, but sometimes we can't even find the cause of the allergy, which leads to untimely treatment. In fact, there are many types of allergens. Sweating, sunlight, mosquitoes, seafood, fruits, metals, sunscreen, etc. can all cause allergies, and the causes and degrees of allergies will vary depending on individual skin type and constitution. Let us now understand the types of allergies and the causes of allergies for no reason so that we can better deal with sudden allergies!

1. What are allergic skin diseases? Allergic diseases, also known as allergic diseases, refer to abnormally strong reactions caused by people encountering antigens or haptens. The symptoms of allergic skin diseases include redness, swelling, itching and pain, especially itching.

2. Allergic skin diseases include: Contact dermatitis, which refers to the local occurrence of erythema, edema, itching and pain after the skin comes into contact with a certain substance. In severe cases, blisters and peeling may occur. Allergic eczema can occur anywhere on the body surface and recur repeatedly. The rash has various forms, and erythema, papules, blisters, erosions, exudation, scabs, desquamation, pigmentation, etc. can be seen locally or systemically. The more you scratch, the more itchy it becomes. It usually develops from acute to chronic, and the cause is complex. Urticaria, localized edematous wheals of varying sizes appear on the affected area, ranging from the size of a grain of rice to the size of a palm, and are commonly the size of a fingernail to a coin, slightly higher than the surrounding skin. The skin will experience severe itching or a burning sensation. Acute urticaria is often associated with allergies.

The second largest allergen: When the sun is shining brightly, the exposed skin will become extremely itchy after being exposed to the sun. After scratching, red bumps of varying sizes will appear, and the symptoms will become more and more severe... This is the legendary ultraviolet allergy! Ultraviolet allergy is an abnormal photoallergic reaction caused by sunlight on the human body; photoallergic reaction is an immune reaction. As long as there is a small amount of photosensitive substances in the human body, a reaction will occur when exposed to ultraviolet rays. It manifests as erythema, papules, wheals or blister-like rashes on the face, neck, forearms, sides of the body, back of the hands and other easily exposed parts. After exposure to sunlight, the skin lesions are significantly aggravated and the itching is intensified. The rash often recurs, and over time, lichenification and pigmentation may occur.

The third largest allergen: mosquitoes. Insect bites (mosquitoes, mites, etc.) cause skin allergies, which is one of the main skin allergies in summer. The most common ones are insect bite dermatitis, papular urticaria, etc. Some people develop a series of light pink "bumps" with a "blister" in the middle after being bitten by mosquitoes. This is a typical manifestation of papular urticaria. Just rinse the bitten area with soap and water, don't scratch it! In summer, the indoor temperature is hot and humid, mites multiply in large numbers, and people are prone to allergies. One of the easiest places for mites to hide is in an old mat. If you must use a cool mat, you should thoroughly wash it with boiling water, blow dry it, and expose it to the sun. In addition, wash your sheets and pillowcases frequently, and ventilate the room to keep it dry.

The fourth largest allergen: Seafood According to epidemiological surveys, the number of people in the United States who are allergic to aquatic products has reached 6.9 million, accounting for 2.3% of the total population. An epidemiological survey conducted by the Chinese Center for Disease Control and Prevention found that the incidence of food allergies among adults in my country is as high as 6%, and the main allergic foods are aquatic products and eggs. Among aquatic products, seafood allergies account for the highest proportion. Seafood allergy can cause patients to experience allergic symptoms such as skin redness, asthma, rhinitis, etc. In severe cases, it is accompanied by collapse, shock, and even life-threatening, seriously affecting the physical health and quality of life of allergic people.

The fifth major allergen: Fruit. Summer is the peak season for fruit allergies. There are many patients who suffer from itchy, red and swollen skin due to eating pineapples, contact dermatitis on the lips due to eating mangoes, and many allergy patients who feel numbness and swelling in the mouth after eating peaches and lychees. If you are sure that you are allergic, it is best to close your eyes and stay away from these fruits. Don’t look at them, don’t buy them, and don’t eat them!

The sixth largest allergen: Metal. I often see a red circle around people’s necks where they wear necklaces. What’s going on? The essence of metal allergy is a disorder of the immune system. Metal allergies usually manifest as contact allergies to metals that we come into contact with on a daily basis. It is more common that these metals contain nickel (Ni) or have been electroplated (nickel is used in electroplating). In summer, the chemical components (salt ions) in sweat will make these metal elements more active (ionized) and easier to penetrate into the skin. Therefore, this "rotten" phenomenon will be more serious in summer. In addition, metal cobalt (Co) and chromium (Cr) have also been documented to cause metal allergies. Metals with higher stability, such as pure gold and pure titanium, are less likely to cause metal allergies. The surface of pure silver is usually covered with transparent silver oxide, which is more stable and less likely to cause allergies.

The seventh major allergen: sunscreen . Sunscreen is indispensable for every girl who loves beauty! However, many women return from traveling with their entire bodies red. This is not because they are sunburned, but because they are irritated by the sunscreen. This is very embarrassing... For people with sensitive skin, it is recommended to choose physical sunscreen products. The main ingredients of physical sunscreen are titanium dioxide and zinc oxide, both of which are hardly absorbed by the skin and are highly safe. However, the chemical ingredients in some chemical sunscreens are easily absorbed by the skin and are not suitable for people with sensitive skin.

4. A warm reminder from the Chinese medicine health teacher: When you have allergic symptoms but don’t know what you are allergic to, you can go to the hospital to check for allergens. Once the allergens are identified, the most economical and practical method is to stay away from them! For patients with allergic skin diseases, those with mild symptoms can apply ice water to the affected area to have a calming effect; moderate allergies will cause obvious erythema and pimples, and oral antihistamines are needed. Many patients go to drugstores and buy ointments to apply casually, not knowing that some ointments contain powerful hormones that can make people "dependent" on hormones, making treatment more troublesome. Therefore, it is best to go to the hospital to get medicine and undergo regular desensitization treatment when necessary!