Background: Fumaric acid esters (FAE) have been used as a drug since 1959. The therapeutic preparation containing FAE has been one of the prominent drugs used for the systemic treatment of psoriasis since 1994 in Germany. FAE have been used in the treatment of sarcoidosis, granuloma annulare, necrobiosis lipoidica, cheilitis granulomatosa, annular elastotic giant cell granuloma, malignant melan...
