Midline congenital upper lip sinus: a rare clinical case with analytical review of diagnostic and therapy strategies.

Congenital midline sinus of the upper lip is rarest malformation with or without other anomalies. Mostly the sinus opens below the white role on the vermilion and has no intra-oral communication. To date, there have been only several case reports of upper lip sinuses associated with other anomalies, such as cleft palate or transverse facial cleft in China. We herein present a case of congenital upper lip sinus in the middle of the philtrum presenting as whitish discharge used to come out of it and review the current literature on this condition.