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).