[Mucinosis follicularis. Histologic and electron microscopy studies].

We studied a case of idiopathic mucinosis follicularis which persisted for 7 months. Histologically, the strong pathological changes began within the sebaceous glands and secondarily occurred in other parts of the pilosebaceous unit. We could demonstrate by electron microscopy that all the follicular cells in this process were undifferentiated sebaceous cells. Therefore, we think that the pathogenesis of mucinosis follicularis originates from a disturbance in the differentiation process of sebaceous cells.