Pili Annulati

Excerpt

Pili annulati (PA), also known as « ringed » or “Morse alphabet” hair, is a rare benign disorder characterized by a unique speckled and banded appearance of the hair with alternate light and dark bands. This appearance results from an increased light reflex caused by a periodic occurring of abnormal air-filled cavities within the hair shafts of affected individuals. Pili annulati belongs to the group of hair shaft disorders without fragility. Although there are reports of some sporadic cases, it is considered to be an inherited disorder.