Any porokeratosis (disease) in which the cause of the disease is a mutation in the FDPS gene. The disease is porokeratosis 9, multiple types (MONDO_0014713, a Monarch Disease Ontology entry). Also known as: FDPS porokeratosis (disease), POROK9, porokeratosis (disease) caused by mutation in FDPS, porokeratosis 9, multiple types; POROK9.