All are true about the features of erythromelalgia , EXCEPT:
Erythromelalgia Syndrome of unknown etiology It is associated with thrombocytosis Manifested by erythema, warmth, and pain of the affected appendage and occasionally digital infarction. It usually respond to salicylates. Ref: Harrison, E-18,P-903
Unknown aetiology
Thrombocytosis is seen
Digital infarction is seen
Treatment is steroids