[Acquired hemophilia].

Introduction: Acquired hemophilia is a hemostasis disorder that occurs due to the presence of inhibitory autoantibodies that are directed against coagulation factor VIII. Clinically, it is manifested by spontaneous bleeding mainly in the skin and soft tissues, and unlike hereditary hemophilia ,the presence of hemarthrosis is infrequent. Although many cases are idiopathic, secondary causes must be sought since their treatment is key in the prognosis of the disease. Among these, the presence of autoimmune diseases, neoplasms, drugs, pregnancy, and postpartum stand out. Treatment is based on hemostatic measures to control the bleeding, and therapies to erradicate the autoantibody.

Methodology: In the following manuscript we describe four patients with acquired hemophilia its etiology, treatment, and prognosis.

Results: All four patients had resolution of the bleeding after specific treatment.

Conclusion: Acquired hemophilia is a rare disorder of hemostasis that should be suspected in patients with extensive spontaneous hematomas without prior coagulopathy. Although in many cases an underlying etiology is not found, secondary causes must be sought since their treatment is key to the patient's evolution.