The first signs of a sunburn may not appear for a few hours. The full effect to your skin may not appear for 24 hours or longer. Possible symptoms include:
•Red, tender skin that is warm to the touch
•Blisters that develop hours to days later
•Severe reactions (sometimes called sun poisoning), including fever, chills, nausea, or rash
•Skin peeling on sunburned areas several days after the sunburn
Symptoms of sunburn are usually temporary. But the damage to skin cells is often permanent, which can have serious long-term effects, including skin cancer. By the time the skin starts to become painful and red, the damage has been done. Pain is worst between 6 to 48 hours after sun exposure.