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.

19.4%) and lip crusting (6 cases, 19.4%) Twenty-five (80.6%) patients experienced mucosal involvement, including oral mucosa (21 patients, 67.7%), conjunctiva (10 patients, 32.3%), and genitals (8 ...