Permanent skin staining can occur with use of parenteral iron if there is
extravasation (leakage of fluid) into the surrounding tissues. An increase in reports of iron staining in recent years has been attributed to increased use of intravenous (IV) iron.
While skin staining can also occur with intramuscular or IV iron , this safety
alert focuses on IV administration.

IMSN Safety alert: Risk of permanent skin staining due to extravasation of intravenous iron infusions