The vermilion (reddish) border of the upper lip may be thinner than normal in a number of disorders.
Differential diagnosis of a thin vermilion border on the upper lip:
(1) Miller-Dieker syndrome (lissencephaly)
(2) geleophysic dysplasia
(3) Cornelia de Lange syndrome
(4) fetal valproate syndrome
(5) toluene embryopathy
(6) fetal alcohol syndrome
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Specialty: Otolaryngology
