UV allergy

Ultraviolet allergy is because the two penetrating ultraviolet rays, UVA and UVB in the sun, reach the dermis of the skin directly, causing the skin of the allergic people to experience red, burning, heat, and pain reactions. At the same time, UV allergies can also cause "health "Killer"-Free radicals increase sharply in the body, causing local skin to produce wrinkles, pigmentation, cell damage, and may even change the immune system, causing more severe phototoxicity or photoallergic reactions. Ultraviolet allergy is an abnormal photoallergic reaction caused by sunlight on the human body. Photoallergic reaction is an immune response. As long as there is a small amount of light-sensitive substances in the human body, the reaction will occur after exposure to ultraviolet light. Erythema, pimples, wind masses, or vesicular-like rashes appear on easily exposed areas such as the forearm, the side of the body, and the back of the hand. After sun exposure, the skin lesions are significantly aggravated and the itchiness becomes worse. The rash often recurs, and over time, lichen-like changes and pigmentation occur. The symptoms are particularly severe in spring, summer, and autumn; it is also called solar dermatitis. After exposure to the sun in midsummer, erythema, blisters, etc. appeared on exposed skin on the neck, face, arms, shoulders, and back, and itching was painful after burning. After a few days, the erythema or edema subsided, followed by desquamation, molting, and temporary Pigmentation. This process is an acute damaging reaction of the skin under strong sunlight, that is, sunburn. After repeated sunburn, the skin is also sensitive to light. After being exposed to strong sunlight, a photosensitivity reaction occurs, that is, sunlight. Dermatitis.