Hermansky-Pudlak Syndrome 4, also known as hps4, is related to isolated delta-storage pool disease and hermansky-pudlak syndrome 1, and has symptoms including abdominal pain An important gene associated with Hermansky-Pudlak Syndrome 4 is HPS4 (HPS4 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 2). The drugs Pirfenidone and Pravastatin have been mentioned in the context of this disorder. Affiliated tissues include lung and skin, and related phenotypes are reduced visual acuity and bruising susceptibility