[Mastocytosis in children. Report of 3 cases]

The mastocytosis is a disease characterized by an increase in mast cell number, and may present in childhood. It is classified as cutaneous or systemic mastocytosis. Cutaneous mastocytosis generally is selected in childhood. It is important to be aware of systemic complications. Systemic mastocytosis is adult-onset and its clinical presentations is caused by histamine, leucotrienes, prostaglandins and other mediators' release. The treatment is directed at symptomatic relief. Several cases are reported at Hospital Infantil de México Federico Gómez. Only 3 cases are presented of these benign child-onset diseases.