title: The lips: anatomy and differential diagnosis.
abstract: The lips are composed of striated muscle and connective tissue and are anatomically positioned to be maximally exposed to sunlight, environment, food, and tobacco. A number of topics relevant to the lips are presented, including contact dermatitis, contact urticaria, benign and malignant systemic processes, and the effect of systemically administered pharmacologic agents on the lips.
mesh_terms: D002613:Cheilitis / Q000175:diagnosis; D003677:Deficiency Diseases / Q000175:diagnosis; D003877:Dermatitis, Contact / Q000175:diagnosis; D003937:Diagnosis, Differential; D006560:Herpes Labialis / Q000175:diagnosis; D006801:Humans; D008046:Lip / Q000033:anatomy & histology*; D008047:Lip Diseases / Q000139:chemically induced / Q000175:diagnosis*; D014581:Urticaria / Q000175:diagnosis