If a patient has a UV allergy or increased sensitivity to UV light, the following steps can usually be taken to prevent a reaction: Avoid sunlight during peak hours. Try to avoid the sun between 10 a.m. and 4 p.m. Avoid sudden exposure to large amounts of sunlight. Many people experience UV allergy symptoms when exposed to sunlight in the spring or summer. Gradually increase the amount of time you spend outdoors so that your skin cells have time to adjust to the sun. Wear sunglasses and protective clothing. Long-sleeved shirts and wide-brimmed hats can help protect the skin from the sun. Avoid using thin or loosely woven fabrics, as UV rays can pass through them. Use sunscreen. Use a broad-spectrum sunscreen with an SPF of at least 30. Applying sunscreen is something that should be reapplied every two hours, or more frequently if you are swimming or sweating. Avoid known triggers. Avoid triggers if a substance is known to cause a skin reaction, such as a medication. Treatment for UV depends largely on the type of allergy; for mild cases, simply avoiding the sun for a few days will resolve the signs and symptoms. If the condition is severe medication can be taken as prescribed by your doctor.