Swollen lips may be caused by allergic reactions, injuries, chapping or sunburn, infections, and cysts called mucoceles. The swelling comes from either inflammation or built-up fluid under the skin.

While the number of people undergoing cosmetic surgery in the UK dropped by 40% in 2016, thanks to the "Kylie Jenner effect", non-surgical treatments (injectables like lip fillers and botox) are on ...