The symptom of UV allergy is itching in areas exposed to sunlight. When the skin is exposed to ultraviolet rays from the sun, rashes may occur in exposed areas such as the face, neck, back of hands, etc.

According to the severity of skin reaction, it is divided into first-degree ultraviolet allergy and second-degree ultraviolet allergy.

First-degree ultraviolet allergy manifests as diffuse erythema on local skin after sun exposure.

Second-degree ultraviolet allergy manifests as local skin redness and swelling, followed by blisters or even bullae, with tense blister walls and light yellow blister fluid. Feeling of burning or itching. After the blisters rupture, they will appear eroded, and soon dry up and become scabbed, accompanied by pigmentation. Severe ultraviolet allergy will be accompanied by uncomfortable symptoms such as systemic fever, headache, palpitations, fatigue, nausea, and vomiting. Ultraviolet allergy: UVA and UVB, the two penetrating ultraviolet rays in the sun, will directly reach the dermis layer of the skin, causing the skin in the exposed area of ??allergic people to appear red, burning, hot, and painful. This is what is often referred to in medicine as solar sensitivity. Dermatitis, that is, ultraviolet allergy; at the same time, ultraviolet radiation can also cause a "health killer" - a sharp increase in free radicals in the body, causing wrinkles, pigmentation, cell damage in local skin, and even changing the immune system, causing more serious phototoxicity or photoallergic reaction.

Conventional UV protection measures include sunscreen and anti-UV parasols. Sunscreen can only block part of UVA and is not very effective against UVB, while anti-UV parasols can block UV rays reflected from the ground and walls. UV rays are completely ineffective.

People’s exposure to the sun not only causes skin allergic reactions, but also has a greater risk of skin cancer than ordinary people. It is an indisputable fact that excessive sun exposure can cause skin damage and even skin cancer. Skin cancer accounts for more than 50% of cancer patients in Westerners. Skin cancer patients are also on the rise in the world. Long-term exposure to the sun should be avoided as much as possible. The symptom of skin allergy is itching in the area exposed to the sun. The longer the exposure time to the sun, the more serious the allergic reaction will be, and the skin itching will last for 24 to 48 hours, or even longer.

Ultraviolet rays in sunlight may cause cataracts. Since the damage caused by sunlight to the eyes is not easily noticed by patients in the short to medium term, the potential threat to it cannot be ignored.