Can rain cause skin allergy?

It rains all year round, and when it rains, it also brings many influences to people's travel, such as urban waterlogging, traffic congestion, blurred vision, etc., which leads to some traffic accidents, but some people are allergic to rain! Can rain cause skin allergy? Why is the skin allergic to rain?

1, rain can cause skin allergies.

There are two kinds of allergies, one is exogenous and the other is endogenous. What you said belongs to the former exogenous allergy, which is caused by external factors.

Urticaria can only be relieved by routine drugs, but it can't be cured, and it is easy to recur. Long-term clinical practice of traditional Chinese medicine has accumulated many very effective strange prescriptions. It is recommended that you use effective Chinese medicines, such as Herba Ephedrae, Cortex Dictamni Radicis, Kochia scoparia, and Euphorbia humifusa. Clearing heat and expelling wind, removing dampness and relieving itching can completely cure the recurrence. During the treatment, you must drink plenty of boiled water to keep your stool unobstructed.

There are two kinds of cold urticaria, acquired cold urticaria and familial cold urticaria. After cold, wind masses appear at the contact parts, and in severe cases, hypotension and shock may occur. Etiology and pathogenesis The pathogenesis of acquired cold urticaria is not clear. After 30 minutes of cold stimulation, the histamine content in blood increased by more than 5 times, indicating that mast cells in tissue, basophils in blood and their chemical mediators played an important role in the pathogenesis of the disease. Passive metastasis is positive, the main antibody is IgE, and a few patients also have IgM and IgG. Recently, some people think that inflammatory mediators are related to the occurrence of this disease. Because giving antihistamines still can't inhibit the clinical symptoms of some patients. Familial cold urticaria is autosomal dominant inheritance.

2. Rainwater is generally weakly acidic.

1. Because there is carbon dioxide in the air, it reacts with water to generate carbonic acid, which makes normal rain slightly acidic. Generally, the pH value is around 5.6.

2. Due to other factors, there may be some deviation from 5.6, which is normal.

3. Due to the change of air composition in some areas, the pH of rainwater may also be affected. For example, if the content of sulfur dioxide or nitrogen oxides in the air is too high, the pH value will be greatly reduced to below 5.6. Such rain is called acid rain, which is an important monitoring index of air pollution. Spring is here, and it's a good time for an outing. It's sunny outside, the ultraviolet rays are enhanced, the allergens in the air are increasing, the pollen index is on the high side, and some pollen particles are very small, which can easily drift in the air with the spring breeze, and people with skin allergies are suffering again. Rain and solar terms, be careful of allergies when going out.

3. Clinical symptoms of urticaria

I. Clinical manifestations

1. Acquired cold urticaria is an allergic reaction caused by exposure to cold environment, with edema and wheal. It is common in parts immersed in cold water or exposed to cold substances, especially in the face and hands, and can also involve other parts in severe cases. Feel itchy. When people with this allergic constitution swim or take a cold bath in cold water, they will have headache, skin flushing, hypotension and other systemic symptoms, and in severe cases, they may have shock. After several years, the symptoms of such patients can disappear on their own.

2. Familial cold urticaria often occurs in infancy and can be seen as early as 1 week after birth. The patient caught cold for half an hour to four hours and developed a rash, burning sensation and no itching. The rash is erythema and wind lump, accompanied by fever, chills, joint pain, headache and other systemic symptoms. With the increase of age, the condition gradually eased. This disease will last a lifetime.

3. Laboratory examination showed that acquired cold urticaria was positive in ice test, while familial cold urticaria was mostly negative. Leukocytosis can be seen in the latter, while the former is rare. 20% patients with cold urticaria have increased cryoglobulin.

4. Clinical treatment of urticaria

Treatment 1. Chinese medicine treatment of cold urticaria mostly belongs to wind-cold syndrome. Visible fever, aversion to cold, no sweat, aggravated by cold, reddish or pale wind, tight pulse, thin and white fur. Treatment of ephedra and cassia twig with modified Bantang. Ephedra is reused for those who have no sweat, while cassia twig is reused for those who are sweating and afraid of cold. Repeatedly, the author can use Yupingfeng Powder (Radix Astragali, Ramulus Cinnamomi, Rhizoma Atractylodis Macrocephalae, Radix Saposhnikoviae and Radix Aconiti Lateralis).

2. Western medicine gives antihistamines: Saigengding is effective for cold urticaria. 2 ~ 4 mg, 3 ~ 4 times a day. It is reported that penicillin 1 10,000 units, intramuscular injection, 2 ~ 3 days 1 time, 1 time is1course of treatment, which is effective for patients with hyperhidrosis. Cold desensitization therapy can be used for patients who do not respond to antihistamines. 1 arm immersed in 15. C 5 minutes in water, initially 1 hour 1 time, gradually extended to 24 hours 1 time, which can prevent the occurrence of rash.