Microgenia

Microgenia is the medical term for an unusually small or deformed chin.^[1]

The contrasting condition, an enlarged chin, is called "macrogenia".^[2][3][4]

There are seven different chin deformities:

• Class I: Macrogenia (chin excess)
• Class II: Microgenia (chin deficiency)
• Class III: Combined excesses and deficiencies
• Class IV: Assymmetric deformity
• Class V: Witch's chin
• Class VI: Pseudomacrogenia
• Class VII: Pseudoretrogenia

Class II microgenia is the most commonly encountered chin deformity, followed by class II macrogenia.^[5]

Causes

Can occur in anyone, but is often a sign of Down syndrome.^[6][7][8]