X-type histiocytosis
# 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 $monocytes/macrophages.^{:720}$ Conditions included in this group $are:^{:720–4}$

   * Congenital self-healing reticulohistiocytosis

   * Langerhans cell histiocytosis
