Classification They are divided into three types based on their location: * commissural<unk> s, which are small<unk> s near the labial commissure of the mouth, * a<unk>  in the upper<unk> , in which case it may be called a midline sinus of the upper<unk> , and *<unk> s in the lower<unk> , in which case it may be called a<unk>  sinus of the lower<unk> . In some cases commissural<unk> s have been reported in combination with preauricaluar<unk> s, which are near the ear.
Congenital lip pit
Branchial cleft cyst
Linitis plastica
Pachydermoperiostosis
Epiblepharon
Torus palatinus
Nasolabial cyst
Sponastrime dysplasia