Microstomia

Microstomia (from Greek micro- 'small' and -stomia 'mouth') is the medical condition of an abnormally small mouth.

Microstomia
Acquired microstomia from congenital syphilis
Specialty	Medical genetics

Congenital

It is a feature of many craniofacial syndromes, including Freeman–Sheldon syndrome and Sheldon-Hall syndromes (or distal arthrogryposis multiplex congenita). It may present with whistling-face feature, as well, as in Freeman-Sheldon syndrome. In this syndrome, it impairs alimentation and may require repeated oral surgeries (called commissurotomy) to improve function.^{[citation needed]}

Acquired

Microstomia can occur as a result of scarring due to many conditions. It is seen as complication of facial burns.^[1] It can also be a feature of systemic scleroderma.^[2]