Bruising: when it is spontaneous and not idiopathic thrombocytopenia purpura.

Bruising is a presentation that often causes concern. There are many causes of bruising in children, including non-accidental injury, which must be excluded. We report a case of a 22-month-old boy where all the common diagnoses were excluded. We highlight the need to be aware of transient acquired inhibitors of coagulation that can cause spontaneous bleeding.