How Do I Treat Photodermatitis?

Photosensitivity dermatitis is sometimes considered to be an allergy to sunlight, a reaction of the immune system triggered by sunlight. Photosensitivity dermatitis includes solar urticaria, chemical photosensitivity dermatitis, and pleomorphic solar rash, which is characterized by an itchy, sudden rash on the site exposed to sunlight. This light-sensitive constitution can be inherited. General diseases such as systemic lupus erythematosus and polyporphyria are also caused by

Photosensitive dermatitis

Photosensitivity dermatitis is caused by allergies to ultraviolet rays in patients. It is only seen in a small number of people. Patients usually develop the disease 1 to 2 days after sun exposure. The rash often occurs in the "V" region of the face, neck and front of the neck, the back of the hand and the extension of the upper limb , Manifested as small pimples, small blisters, conscious itching, if not actively treated, can form chronic photosensitive skin diseases.

Photosensitivity Dermatitis Disease Introduction

Photosensitive dermatitis Symptoms after exposure to sunlight.

classification

Solar urticaria is a wind mass (large, itchy erythema) that occurs when exposed to the sun for a few minutes. Wind masses occur within ten minutes of exposure to the sun and dissipate 1-2 hours after leaving the sun. People with large outbreaks often have headaches, weakness, and nausea.

Chemical solar rash is progressive redness, inflammation, and sometimes bluish pigment spots after exposure to sunlight for a certain period of time. This reaction differs from solar eruption in that it occurs after the patient has taken or externally applied certain medications. These drugs make some people's skin more sensitive to UV rays. Some people suffer from itching caused by sunlight-induced allergies after taking certain medications.

Polymorphic solar rash is a special reaction to sunlight of unknown etiology. It is a common skin disease that is prone to occur in women and people who have not been exposed to the sun regularly. A widespread red pimples and irregular rashes appeared on the sun-exposed areas during the attack. These rashes usually appear 30 minutes to several hours after sun exposure. The pimples and erythema usually resolve around a week. In particular, people who have this condition continue to stay outdoors to reduce their sensitivity to sunlight.

Causes of Photosensitive Dermatitis

Photosensitive dermatitis and adverse reactions to drugs

Antihypertensive drugs commonly used in clinical practice, such as Zhenju Antihypertensive Tablets and Compound Antihypertensive Tablets, all contain thiazide diuretics. The literature reports that there are many cases of photosensitivity dermatitis. Adverse drug reactions.

Photosensitivity dermatitis refers to skin reactions that occur after exposure to certain foreign photosensitizers and light. Common drugs that can cause skin photosensitivity reactions are: thiazide diuretics, chloropropane, non-steroidal anti-inflammatory drugs, tetracycline Sulfonamides, tranexamic acid, amiodarone, quinine and quinidine, furosemide, etc.

Conditions under which photosensitive dermatitis occurs

There are two conditions for its occurrence. One is that exogenous photosensitizers are absorbed through skin contact or taken orally. The other is that the skin absorbs a certain amount of energy and a certain wavelength of light. The skin damage caused by it is various and can be expressed as edema. The distribution of erythema erythema, pimples, plaques, nodules, and skin lesions is limited to light-exposed areas, such as the head (thinner), double frontal area, front ear, back of neck, and back of hand, etc. Epidermal erythema, occasional or maculopapular rash, pale red, bright red, or dark red. The light ones are scattered small pieces, and the heavy ones can be merged into large pieces with or without edema, and may be accompanied by desquamation and pigmentation with the disease. All Patients have varying degrees of itching or burning sensation.

Drug-induced photosensitive dermatitis is often misdiagnosed as general dermatitis or sunburn in the clinic and should be taken seriously. The diagnosis is mainly based on the fact that the distribution of the damage is in the light-exposed part rather than the general exposed part. The skin lesion is a manifestation of phototoxic reaction. There is a clear history of taking light-sensitive drugs and the onset season is mostly in the early spring. Based on this, you can distinguish contact dermatitis, polytype solar rash and sunburn.

Photosensitivity dermatitis is most often caused by perfumes contained in cosmetics. For example, soaps, facial cleansers, shower gels, etc. contain a variety of complex fragrance ingredients. They penetrate into the skin during bathing and cause allergic reactions to the skin of some people under the effect of scattering sunlight. Patients with photosensitive dermatitis can alleviate the condition and prevent recurrence of photosensitive dermatitis as long as they take a shower with cold or warm water and do not use any clean skin care products on the skin.

Photosensitive dermatitis diagnostic criteria

Phototoxic dermatitis is localized

Photosensitive dermatitis Flaky erythema with burning sensation or pain. In severe cases, edema and blisters or conjunctivitis and systemic symptoms such as headache, dizziness, fatigue, thirst, and nausea can occur. Can be diagnosed if:

1 There is a clear history of occupational exposure to a certain amount of light-sensitive substances before the onset of illness, and it is exposed to sunlight of a certain intensity and time.

2 Skin lesions occur in areas that come into contact with light-sensitive substances and are exposed to sunlight.

3 Most people develop the same disease under the same conditions.

4 Skin lesions begin within hours of exposure to sunlight.

5 After detaching from contact with light-sensitive substances or avoiding sunlight, dermatitis subsides quickly, and localized pigmentation may be left in different degrees.

6 If necessary, a light spot patch test can be performed, showing a sunburn-like reaction.

Photosensitivity Dermatitis Treatment

Anyone who has received excessive amounts of ultraviolet light may develop photosensitive dermatitis, which has nothing to do with the body's own immune system, mostly caused by UVB. Symptoms of an acute attack are erythema, edema, and blisters in severe cases, accompanied by a burning sensation on the skin exposed to the sun. After the acute phase has passed, symptoms such as peeling pigmentation will appear. If it is not repaired in time, the skin may appear loose, dry, rough, wrinkles or deepened wrinkles, skin keratinogenesis, cell atrophy, and capillary dilatation.

Some things in life may increase the body's absorption of ultraviolet light and should be avoided as much as possible. For example, coal tar contains 25 known phototoxic substances, such as anthracene, benzpyrine, acid, pyridine and so on. Some inferior perfumes, lipsticks and other cosmetics are also an important cause of phototoxic dermatitis. In particular, some sunscreen products may also cause phototoxic dermatitis, so you must choose carefully.

Compared with photosensitive dermatitis, photosensitive dermatitis should be an eczema lesion of the skin's immunity (allergic reaction) to ultraviolet rays. After some light-sensitive substances enter the body, they form an antigenic substance because of sunlight and protein in the body, which stimulates the body to produce antibodies and sensitizes lymphocytes, antigens and antibodies or antigens and sensitized lymph

Photosensitive dermatitis Bar cells respond to photosensitivity dermatitis, which is usually caused by UVA. If it is only exposed to light-sensitive substances without being exposed to ultraviolet rays, no harm will occur. In addition to being related to food and medicine, this lesion is also related to heredity, whether it is allergic, and the emphasis and scope of receiving ultraviolet rays.

Specifically, it can be divided into photosensitivity drug reactions caused by drugs and photosensitivity dermatitis caused by contact with light-sensitive substances in life. Symptoms are as follows: When exposed to ultraviolet light after exposure to photosensitive substances or drugs, erythema will appear within twelve hours, with swelling and blisters may appear, accompanied by a burning sensation, but generally not Feeling pain. Occurs on the face, forearm, back of the hand and other parts. \ In time to repair in three or five days, it may completely disappear. But if not repaired, pigmentation may be left behind.

Precautions for photosensitive dermatitis

Some people suffer from photosensitivity dermatitis due to exposure to a large amount of ultraviolet radiation or eating some photosensitive vegetables. Doctors remind that photosensitivity dermatitis should be prevented in summer.

Photosensitivity dermatitis usually develops within one to two days after human exposure to the sun. The rash is more common on the face, neck, back of hands, and upper limbs. It mainly manifests as small papules, small blisters, erythema, etc., and iterative consciousness. Non-light areas can also cause rashes, no pain, abnormal itching, and slow disappearance. If not actively treated, chronic photosensitive skin diseases can also form.

Summer is a season of frequent skin pathogens. People should take good protective measures when they are engaged in outdoor activities, and wear sun hats, long trousers, and parasols. If the symptoms are obvious, you can take some anti-allergic drugs. There are still some people who eat a lot of vegetables, such as celery, rape, spinach, and cabbage, and are likely to cause photosensitivity dermatitis when exposed to light. If this happens, they should go to the dermatology department of a regular hospital in time to avoid Vegetable pesticide residues cause skin diseases. When eating vegetables and fruits, you must rinse them several times, soak them for a period of time, drain the water, and eat them after washing.

There are many types of photosensitive dermatitis. In summer, the most common is small pimples that occur on exposed areas such as the face and arms. Unlike sun dermatitis, it does not have a strong history of sun exposure, it does not happen to everyone, and it does not cause large-scale peeling.

Photosensitivity dermatitis is most often caused by perfumes contained in cosmetics. For example, soaps, facial cleansers, shower gels, etc. contain a variety of complex fragrance ingredients. They penetrate into the skin during bathing and cause allergic reactions to the skin of some people under the effect of scattering sunlight. Such patients can alleviate their illness and prevent recurrence as long as they take a shower with cold or warm water and do not use any clean skin care products on the skin.

Patients can apply a cold compress on the affected part with a lot of itching: take half a basin of cold water, soak the towel, stack it into four layers, and then squeeze the towel into a dry half, and apply it tightly. Rinse every 3 minutes and relieve itching several times. After itching again, it will eventually heal after a few days. Some people do the opposite, not only frequently washing with soaps, but also applying antipruritic drugs containing "pine" hormones, which often make the disease stubborn, relapse every year, and lose more than it pays.