Elfin facies is a form of facies

Facies (medical)

In medical contexts, facies are distinctive facial expressions associated with specific medical conditions.It comes from the Latin word for "face".As a fifth declension noun, "facies" can refer to the singular or plural.-Types:Examples include:...

 where the patient presents with facial characteristics bearing some similarities to those traditionally associated with elves

Elf

An elf is a being of Germanic mythology. The elves were originally thought of as a race of divine beings endowed with magical powers, which they use both for the benefit and the injury of mankind...

. Because of imprecision inherent in such as definition, as well as the potential for offense, it is better to use more specific terminology when possible, such as low-set ears

Low-set ears

Low-set ears is a term used to describe a depressed positioning of the pinna two or more standard deviations below the population average.It can be associated with conditions such as:* Down's syndrome and Turner Syndrome* Noonan syndrome* Patau syndrome...

.

It can be associated with Williams syndrome

Williams syndrome

Williams syndrome is a rare neurodevelopmental disorder characterized by a distinctive, "elfin" facial appearance, along with a low nasal bridge; an unusually cheerful demeanor and ease with strangers; developmental delay coupled with strong language skills; and cardiovascular problems, such as...

 or leprechaunism.