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Use an over the counter pain reliever medication, such as ibuprofen or naproxen sodium. The medication will ease the discomfort caused by the sunburn while your lips heal.  Use pain relievers according to their package instructions. Do not overdose. Even over-the-counter pain relievers may interact with prescription drugs or other medications. If you are currently taking any other medications, ask your doctor about which pain relievers are safe for you. Take a clean cloth and let it soak in a container of ice water for a few minutes. Wring out the excess water, then hold it to your lips for as long as the cloth stays cool. Doing this while your lips heal will provide some quick and simple relief. Steep some chamomile tea bags in hot water, then take them out and let them cool. Hold the bags directly to your lips for as long as they stay cool. Chamomile is a natural way to relieve pain from burns, so as long as the bags are cool, they’ll be effective on your sunburned lips.
Take pain-relieving medication. Put on a cold compress. Relieve the pain with chamomile.