congenital self-healing reticulohistiocytosis ( cshr ) is characterized by a neonatal onset , with purple or necrotic nodular lesions showing the histopathologic aspect of histiocytosis x ( although birbeck granules are less numerous ) , an absence of visceral involvement and a spontaneous regression within the first 3 months of life .
C0019618
reticulohistiocytosis
C0019621
histiocytosis