Ultraviolet allergy is an abnormal photoallergy caused by the action of sunlight on the human bodysexual reaction；Photo allergy is a kind ofImmunityReaction, as long as there is a small amount of photosensitive substances in the human bodyultraviolet raysIrradiation will cause reaction, which is manifested by erythemapapule、WhealorBlisterkindrash, after being exposed to sunlight,Skin lesionObviously aggravated,itchThe feeling intensifies.
Rashes often recur, and lichen like changes and pigmentation occur over time.The symptoms are especially serious in spring, summer and autumn;Also calledSolar dermatitis。
The symptom of UV allergy is that the part exposed to the sun appearsitch。When the skin is exposed to sunlight, a rash occurs on the exposed parts such as the face, neck, back of hand, etc.skin sensibilityThe symptom of "1" refers to the itching of the part exposed to the sun. The longer the exposure to the sun, the more serious the allergic reaction,skin ItchIt will last 24 to 48 hours or even longer.Ultraviolet rays in sunlight may causecataractAs the damage of sunlight to eyes is not easily perceived by patients in the short and medium term, it is a potential threat to itNot to be ignored。
classification
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according toSkin reactionThe severity is divided into primary and secondary UV allergy.
Once UV allergy: it appears after local skin is exposed to the sunDiffuseErythema.
Second degree UV allergy: it is manifested as local skin redness and swelling, followed by blisters or evenBullaThe blister wall is tense, and the blister fluid is light yellow.ConsciouslyBurning painOr itchy.After the blister breaks, it shows erosive surface and dries up soonscab, accompanied by pigmentation.Severe UV allergy will accompany the whole bodyfever、headache、palpitation, fatigue, nausea, vomiting and other uncomfortable symptoms.
After being exposed to the sun in midsummer, the exposed skin of neck, face, arm, shoulder and back appeared erythema, blister, etc., which made the burning itch unbearable. After several days, the erythema or edema subsided, and the affected skin appearedDesquamation, molt, and leave temporary pigmentation.This process is an acute injury reaction of skin under strong sunlight, namelySunburn, repeated daysSunburnThe skin is also sensitive to light after being exposed to strong sunlightPhotosensitivityReaction, namely photodermatitis.
Conventional UVProtective measuresincludesunscreen creamAnd UV protectionSunshadeThe use of sunscreen can only block part of UVA, but it is not very effective for UVB, and the anti ultraviolet sunshade has no effect on the ultraviolet reflected from the ground and wall.
People exposed to the sun will not only cause skin allergy, but alsoSkin cancerThe risk is also greater than that of ordinary people.OvermuchsunlightIt is an indisputable fact that radiation can cause skin damage and even skin cancer.Skin cancer in WesternerscancerMore than 50% of the patients are suffering from skin cancerUpward trend, try to avoid long-term exposure in daily life.
Diagnostic Checks
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diagnosis
faculaThe test is a method to diagnose the hypersensitivity to exogenous ultraviolet rays and check the allergens.Here we introduce the most practical SEpstein's method.
Prepare 2 parts of the suspected photosensitizer, place them on both sides of the waist without exposure to sunlight, remove one part of the test material after 48 hours, and use it as a contact reaction test without exposure to light, and then expose the other part toUVA(320nm).After another 48 hours, compare the irradiated area with the previously covered area.
If the test result shows positive reaction in both places, it is contact allergy reaction;If both sites show negative reaction, it is non-contact allergy and non light contact allergy;If only the irradiated part is positive, it is light contact allergy;If the irradiated area is more positive than the non irradiated area, it is contact and lightContact dermatitisBoth.
identify
This disease should be associated with the followingskin diseasePhase identification:
1. Polydipsiavitamin ATo maintain the normal function of the skin.For some possible inducementsSeasonal dermatitisThe photosensitive food should be eaten as little or as little as possible.
2. Try not to wash your face with hot water, alkaline soap or rough towels.
3. Do facial exercises every day.It lasts for 3-5 minutes to promote facial blood circulation and make facial skin shiny.
4. People with a history of seasonal dermatitis should protect their skin from ultraviolet and visible lightdamage。
5. Avoid prolonged exposure to the sun, and use a wide edge during spring outingProtective caporsun umbrellaOcclusion.
6. Do not use cosmetics or spices containing photosensitive substances.
Maintenance measures
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Due to UV allergyImmunityReaction, which requires long-term maintenance. Common UV allergy maintenance measures:
1. Use mild cleaning products with weak acidity to protect the skin from being damaged by alkaline detergent;
1. Cosmetics: low-quality and deteriorated cosmetics, more irritating cosmetics or somePharmaceutical cosmetics。The most typicalCosmetic allergyIt is the essence allergy, andConvergent waterSuch cosmetics containing alcohol will also stimulate the skin to a certain extent.Others such as biochemistrypreservative、Fruit acidAnd so on will cause different irritation to the skin.
3. Drugs: such as contraceptives,penicillin、sulfaSuch drugs may cause skin allergy.
4. Food: CommonseafoodClass, mangoNutFood like this can cause allergies.Such as fish, shrimp, milk, fruit, etc. may also cause allergies.
5、pollen: In the season of pollen transmission, tinyPollen grainstayCommunication processChina CouncilIt spreads in the air and flies around with the flow of air, and some of it will be inhaled by the human body and absorbed by the skin.
6. Dust:Dust allergyIt is a kind of microorganism living in the dustAnaphylactic reaction, is the most common allergy.Dust sensitiveAllergenIncluding cotton fiber, fur and various fibers, animal fur, etc.
7. Age: The growth of age is an important reason for skin sensitivity.Some people's skin is not sensitive in previous years, but it has become sensitive in recent years.This is because there is a layer of weak acid on the surface of young and healthy skinSebaceous membraneProtect the moisture to protect the skin from external damage. However, with the growth of age, this layer of sebum film is not as healthy as before, so that some sensitive substances are easy to invade the skin.
8. Pets:Sensitive skinIt is easy to cause allergy due to the fur of domestic pets.This causePetsThe allergy is mainly caused by the secretion of oil glands on animals such as cats and dogsproteinWhen pets lick their fur, these proteins will stick to the fur, and then disperse to the air, which will attach to the human skin.
12. Other factors: animal hair, metal and clothing are oftenSensitive skinSensitization source of.Some people are allergic to cold, hot air and ultraviolet rays.
Life attention
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Ultraviolet allergy is due to physical problems, and it is not easy to cure. In the past, many people had to let it go because of poor response to drug treatment and continuous recurrence.Therefore, it often indulges its development, causing wrinkles, pigment deposition and cell damage in local skin.People with UV allergy should learn how to coexist with it, which is the fundamental way. Of course, the first thing is to protect against sun.
1. Don't scratch the allergen
Common people have itchy skinIntuitive responseThey all scratch with their hands. This action can not only stop the itching, but also may make the itching more and more severe. The main reason is that when you scratch the local area, the local temperature will rise, and the blood will release more histamine (allergen), which will worsen.
2. Pay attention to skin cleaning
As it belongs to allergic skin, pay special attention when choosing skin care products.Use weak acid and mildCleaning productsTo protect the skin from being damaged by alkaline detergent, use mild skin care products together to protect the skin.It should be noted that hot water, alkaline soap and rough towels should not be used when washing face.
3. Do not apply hot compress to the allergic area
Some people itch enough to want to use hot compress. Although the heat can temporarily relieve the local pain, it is actually another kind of stimulation, because the heat will tension the blood vessels and release more allergens. For example, some people may be immersed in hot springs or bathtubs in winter, or wrapped in thick cotton quilts for excessive warmthUrticaria。
Do facial exercises every day.The method is to gently massage the forehead, zygomatic skin, nose and ears for 3-5 minutes after the five fingers are together and the palms are rubbed with slight heat to promote the faceblood circulationMake the face smooth and clean.[2]
5. Try to eat less photosensitive food
Overeatingcontainvitamin ATo maintain the normal function of the skin.For some inducible springnessdermatitisPhotosensitive substances such as rape, spinach, lettuce, figs, lemons, white radishes, etc. belong to photosensitive plants. If you eat these plants and bask in the sun, it is easy to have UV allergy symptoms, so you should try to eat less or not.
