NCIt definition : A benign histiocytic tumor that arises from the skin and occurs during childhood;
it is distinct from Langerhans cell histiocytosis. It is characterized by the presence
of lipid-laden, foamy histiocytes and Touton-type giant cells in the dermis. The lesions
usually develop during infancy. They consist of cutaneous papules and nodules (most
often in the head and neck).;