Sun allergy or photosensitivity is a condition where the skin reacts to sun exposure in an abnormal way, causing redness, itching, and blisters. Some common synonyms for sun allergy include photodermatoses, sun rash, photosensitive reaction, sunburn sensitivity, and phototoxicity. These terms all refer to an overreaction of the skin to sunlight and UV rays. Sun allergies are often triggered by specific medications, fragrances, or foods, which makes them difficult to treat. However, there are some preventative measures that can be taken such as avoiding sun exposure during peak hours, wearing protective clothing and sunscreen, and using aloe vera or other soothing agents to reduce inflammation.