Erythema Dyschromicum Perstans (EDP) Syn : Ashy dermatosis of Ramirez, erythema chronicum figuratum melanodermicum. [8] Although Ramirez first described what is today labelled EDP, it is Sulzberger who is credited with coining the term EDP. [8] Epidemiology Though EDP has been reported from many countries including India, [9] it is most common in Latin America and Asia.