Sun allergy is an oversensitivity reaction of the skin to UV radiation. This condition affects people who are allergic to sunlight or certain ingredients in sunscreen products. Symptoms of a sun allergy can include rashes, itching, redness, swelling, and blistering. These symptoms usually appear within a few hours of sun exposure and can last for several days.
It's important to note that a sun allergy is not the same as sunburn. Sunburn is caused by overexposure to UV radiation, while a sun allergy is triggered by an allergic reaction to sunlight or sunscreens.