My facial skin is long, dry, peeling and itchy for a year.

The skin is prone to solar rash, how to prevent it? Or how?

In summer, some people are prone to acute skin swelling and even blisters after strong natural sunlight exposure. This is what people often say about ultraviolet allergy, or sunburn and solar dermatitis, which is the acute light that appears after strong sunlight irradiates local skin.

Toxic dermatitis. Ordinary sunburn is not serious, but the delayed allergic dermatosis induced by sun exposure, that is, polymorphic solar rash, is much more serious. It is understood that among patients with solar dermatosis, polymorphic solar rash accounts for 60%. The doctor suggested that if you suffer from solar dermatosis, you should immediately go to a regular hospital to ask a dermatologist for treatment, and you should not use drugs indiscriminately, so as to avoid self-defeating, aggravating skin damage and causing serious consequences.

Be careful of sunburn when swimming outdoors in summer.

Ordinary sunburn treatment is not difficult.

Meng Yue, deputy chief physician of the dermatology department of Friendship Hospital, said that the high incidence of sunburn is in spring and summer, which is caused by the overexposure of UVB with the wavelength of 290-320 nm in sunlight to the skin. Sunburn often varies with skin color, sunlight intensity, exposure time and range. It is particularly prone to sunburn in the environment such as beaches, beaches and mountains. Many swimmers on holiday at the seaside are sunburned like cooked red crabs after swimming, which is also a sign of mild sunburn. The effective ways to prevent sunburn are: often doing outdoor exercise to improve the skin's tolerance to sunlight; People with low tolerance to sunlight should avoid exposure to sunlight when going out and take various shading measures, such as wearing a sun hat, playing a sun umbrella, applying sunscreen, 5% titanium dioxide cream, 10% zinc oxide cream, etc.

The local treatment of common sunburn is based on the principles of anti-inflammation, pain relief and appeasement. Zinc oxide lotion and glucocorticoid cream can be used for external use, and 3% boric acid solution, iced milk, normal saline or 2%-5% Maya decoction can be used for cold and wet compress. Systemic treatment can be oral antihistamines, and severe cases can be oral corticosteroids.

Polymorphic solar rash is an allergic reaction.

The prevalence of women may be related to heredity.

Some people have spotted erythema, edema, papules, papules, wheals, even erosion, exudation, or mossy changes in the exposed parts after several hours to 5 days of sun exposure; Most patients are accompanied by itching and burning sensation. This is probably a polymorphic solar rash. In severe cases, fever, chills, headache, fatigue and nausea may occur. Mild 1-2 days later, erythema and edema gradually subsided, leaving desquamation and pigmentation; If it is serious, it will take about 1 week to recover.

The so-called polymorphic solar eruption is a delayed allergic skin disease induced by sunlight. According to Dr. Meng Yue, at present, it is believed that polymorphic solar eruption may be a cellular immune response caused by light products induced after illumination, and its pathological characteristics are the infiltration of lymphocytes in the skin and the participation of various inflammatory mediators. The disease has a wide spectrum, and genetic, endocrine, age and other factors also play a role.

Such patients often have erythema, papules, wheals, erosion, scabbing, blisters and other polymorphic rashes after being exposed to strong sunlight for the first time in spring. The degree of pathological changes in patients is closely related to sunlight exposure, which is more common in spring and summer, more common in women, and recurrent attacks. Skin lesions often occur in exposed parts such as face, neck, V-shaped area of chest and forearm, and a certain type of rash often occurs in the same patient.

Patients with polymorphic solar rash

Try to avoid strong light.

Such patients should avoid strong sunlight as much as possible, and pay attention to shading and sun protection when going out. Under the guidance of professionals, patients can also use low-dose ultraviolet rays to irradiate the skin, gradually increase the amount of light or take sunbathing therapy to improve the body's tolerance to light.

Patients should avoid using chlorpheniramine, diazepam, phenanthrene, demerol and other drugs that can cause light sensitivity. In treatment, antihistamines can be taken orally, and glucocorticoid can be used to control symptoms for a short time in severe cases; We should always pay attention to the side effects of drugs during medication, and we can combine vitamin B, vitamin C and vitamin b6 for adjuvant treatment. In severe cases, nicotinamide or chloroquine can be taken orally; Topical glucocorticoid cream is effective, but it is not suitable for long-term use; Potential photosensitive substances, such as tar, should be avoided.

Director Meng reminded patients with solar dermatitis that they should try to avoid eating plants containing photosensitive substances such as Chinese cabbage, Chinese milk vetch, Chinese cabbage, amaranth, shepherd's purse, rape, spinach and purslane, which can cause photosensitive dermatitis after eating.

Black beauty is not easy to get sunburned.

Human skin itself is a natural barrier against sunlight. The surface film, cuticle and melanin of normal skin all have certain protective effects on light, especially melanin, so people with sunburn are more likely to have lighter skin color, while those with darker skin color are less likely. Experts suggest that we should pay attention to protecting the normal state and function of the skin, and blindly pursuing skin whitening may not be conducive to the prevention of solar dermatitis. Members of the public can also be exposed to the sun frequently in a short period of time to promote the formation of melanin, thus strengthening their ability to prevent ultraviolet rays.

Photosensitive substances can increase the risk of sunburn.

Common photosensitive substances are asphalt, anthracene, acridine, halogenated salicylanilide, bleaching agent, Long Xianxiang and methyl coumarin. Drugs containing photosensitive substances include chlorpromazine, promethazine, chlorothiazide, nalidixic acid, griseofulvin, sulfanilamide, tetracycline and so on. Plants and foods containing photosensitive substances include gray vegetables, mustard greens, rape, spinach, snow vegetables, Chinese milk vetch, Malantou, buckwheat, lettuce, Sophora japonica, purslane, sprouts, figs and so on. Traditional Chinese medicines containing photosensitive substances include Schizonepeta, Saposhnikovia divaricata, Radix Angelicae Pubescentis, Radix Angelicae Dahuricae, Fructus Psoraleae and rutin. Caution: Do not bask in the sun after touching or taking the above items.

Simple measures to avoid light

What are the effective and simple measures? Wear a sun hat, long-sleeved clothes, and use a sunshade, preferably an ultraviolet umbrella; Use sunscreen or sunscreen at the same time, that is, apply titanium dioxide, zinc oxide, calamine, etc. Before going out 10- 15 minutes, choose a sunscreen with a sun protection index (spf) greater than 15, which is stable and durable, non-toxic and non-allergic; Oral vitamin B, especially nicotinamide, reduces the skin's sensitivity to sunlight.