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Use fresh aloe juice from a cut leaf of the plant, or buy a commercial aloe gel. Smear some of the juice or gel onto your sunburned lips, and let it dry. You should feel some cool relief, and the aloe will also help to heal the burn.  You can purchase aloe leaves from the produce section of some grocery stores, if you don’t have a plant at home. To get at the juice, just cut the outer green layer of the plant to reveal the wet, gel-like inner portion. Do not use an aloe gel on your lips if the instructions do not recommend it. Apply aloe as often as needed. Store your aloe or gel in the fridge for added cooling relief. Many regular lip balms are very effective at healing sunburned lips. Look for one with shea or cocoa butter along with SPF protection. That way, the balm will help clear up the sunburn and protect your lips from further sun damage.  Lip balms come in a variety of forms--tubes, sticks, and pastes. To apply lip balm, rub the tube or stick on your lips (or use your finger to rub on the paste) until they are evenly coated in a thin layer. Apply new lip balm whenever the previous layer wears off. Look for an ointment that is specifically designed for use on lips, since many topical antibiotics (and hydrocortisone creams) are not safe to ingest. Simply rub a layer of the ointment onto your lips once a day. Cook some oatmeal as you normally would. Let it cool. Dab it on your lips once a day like you would a sponge, then rinse it off. Oatmeal is a traditional skin healer that heals sunburns, so this may help heal your lips. Petroleum jelly or products containing it can cause further damage to sunburned skin, so avoid these. In addition, lotions containing pain relievers like benzocaine or lidocaine can actually irritate sunburned skin instead of providing relief, so don’t use them either.
Apply aloe to your lips. Use some lip balm. Rub on a layer of antibiotic ointment, if you have any open blisters. Apply an oatmeal paste. Don’t use petroleum jelly or pain-relieving lotions.