X-type histiocytosis

X-type histiocytoses are a clinically well-defined group of cutaneous syndromes characterized by infiltrates of Langerhans cells, as opposed to Non-X histiocytosis in which the infiltrates contain monocytes/macrophages.^[1]: 720 Conditions included in this group are:^{[1]: 720–4}

• Congenital self-healing reticulohistiocytosis
• Langerhans cell histiocytosis