KIT and mastocytosis: Our search included terms such as ‘neonatal mastocytosis’, ‘infant mastocytosis’, ‘cutaneous mastocytosis’ + ‘infant and/or neonatal’, ‘Darier sign’, ‘c-kit’, ‘KIT gene mutations’, ‘CD117-positive cells’, ‘skin biopsy’, ‘bone marrow biopsy’, and ‘molecular genetic testing’.