Introduction: Pyoderma gangrenosum (PG) is an unusual dermatitis witch is associated at least in half of the cases with a systemic illness.
Case record: A 54 year-old woman suffering from Churg and Strauss syndrome has been monitored for many years. She was hospitalized in dermatology unit for a PG without showing any activity signs of her angeitis. After a well conducted localized treatment, the cutaneous lesions rapidly improved.
Discussion: PG physiopathology is still not well known, but its interest lies in the fact of the high number of associated internal pathologies and is probably linked to granulomatosis such as Churg and Strauss angeitis.