Swelling of the lip can occur from injuries, accidents, and allergies. Here are some ways to reduce the swelling: 1.) Steep a teabag in hot water then allow to cool slightly. Press the teabag against your lips for 5-10 minutes at a time until the swelling goes down. 2.) Wrap some ice in a washcloth, apply the washcloth to your lips for 5-10 minutes. 3.) Apply a thin layer of aloe vera gel onto your lips. .