Basically everyone will often feel itchy skin, and sometimes they will find that the skin becomes red, peels, or even has small rashes. In fact, most of the time itchy skin is caused by allergic dermatitis. Many men will feel itching at the base of their thighs, which may be caused by dermatitis caused by frequent friction due to uncomfortable clothing. The following editor will introduce some common causes of allergic dermatitis. 1. Internal causes: The patient has an allergic constitution, which plays a leading role in the onset of facial allergic dermatitis. In addition, chronic digestive system diseases, mental stress, insomnia, excessive fatigue, emotional changes and other mental changes, as well as infection lesions, metabolic disorders and endocrine dysfunction can all trigger or aggravate allergic dermatitis. Symptoms ① After applying high-efficiency corticosteroids to the same area for more than 3 weeks, the skin develops secondary symptoms such as erythema, papules, dryness and scaling, atrophy, atrophic striae, capillary dilation, purpura, acne, abnormal pigmentation, rosacea-like dermatitis, perioral dermatitis, photosensitivity, hirsutism, unrecognizable ringworms, and ichthyosis-like changes. ② After using hormone drugs, the primary disease can be rapidly improved. However, once the drug is stopped, within 1-2 days, the skin at the site of drug application will develop obvious symptoms such as erythema, papules, cracks, scaling, small pustules, itching and tenderness. When the drug is used again, the above symptoms and signs will subside quickly. If the drug is stopped again, the dermatitis symptoms will recur quickly and gradually worsen. The dependence on hormones is more obvious, especially on the face and vulva. ③ There is obvious local itching or burning sensation. Notes: Allergic dermatitis symptoms are skin inflammation reactions caused by many factors. There are two common types: contact dermatitis and cosmetic dermatitis. Allergic reactions caused by different pathogenic factors are different. When people with allergic constitutions first come into contact with allergens, they will produce corresponding antibodies, which are fixed in the skin and mucosal tissues. When encountering the same allergen again, it will cause mast cells and alkaliphils to degranulate and release allergic reaction mediators such as histamine, and allergic dermatitis will occur. The most common symptoms of allergies are redness, swelling, itching, pain, peeling, etc. Many things in life can cause allergies. It is best to go to the hospital to test for allergens. Try to stay away from substances that are likely to cause allergies. Also pay attention to your diet and try to eat less irritating foods and seafood. |
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