Introduction
Porokeratotic adnexal ostial nevus (PAON) is a term that encompasses
porokeratotic eccrine ostial and dermal duct naevus (PEODDN) and
porokeratotic eccrine and hair follicle naevus (PEHFN).1 PAON is a rare adnexal hamartoma characterized by
the presence of a cornoid lamella exclusively overlying eccrine
acrosyringia (the subype known as PEODDN) or over both eccrine
acrosyringia and hair follicles (the subtype known as PEHFN).