The Upper West Side is primarily residential, with 209,000 people / 1.9 square miles, meaning about 110,000 people per square mile / 42,500 per square kilometer. The most densely populated city in the world.
Likey allergic rxn: Allergic reaction to a number of things could cause swollen lips with associated itchy (sic). Angioedema can cause swollen lips. Important to note if localized to one area or involves the upper and lower lips diffusely. ...Read more.
Respond quickly to an allergic reaction. Some swollen lips are caused by allergic reactions, which can be fatal. Seek medical care right away if this has never happened to you before, if your lips are severely swollen, if it affects your breathing, or if you throat swells.