Eighty‐one cases of lupus miliaris disseminatus faciei were clinically and histologically studied, and some of them were also immunologically studied. Age at onset, distribution of skin lesions, and incidence by sex did not differ from the reports of various investigators. No apparent increase in incidence of this disease was noted. The histologic features of this disease could be divided into four types. Some relation between pilosebaceous units and epithelioid cell granulomas could be found in the lesions of 35 (43%) out of 81 cases. Central caseation may be coagulation necrosis caused by abscesses. Some immunological data were obtained from this study, but there were no abnormalities in delayed hypersensitivity reactions, e.g. tuberculin test, DNCB skin reaction, PHA skin reaction and the Kveim test, or in quantitative serum immunoglobulin surveys. Lymphocyte transformation tests using two mitogens, PHA‐P and Con‐A, showed normal responses. It was not possible to obtain enough data from the clinical data and histologic findings for this disease to be regarded as a tuberculid. But from the histologic findings, lupus miliaris disseminatus faciei was assumed to be a chronic inflammatory disease of pilosebaceous units and epithelioid cell granulomas in the lesions might be reactions to destroyed hair follicles or epithelial cysts. With these assumptions, the following hypotheses concerning the pathogenesis of this disease were proposed. 1) Epithelial cysts occur and rupture in the dermis for some reason resulting in formation of foreign‐body granulomas which break down epithelial cysts in the dermis. 2) Inflammatory infiltrates occur within the follicular epithelium or sebaceous glands for some reason and they are destroyed resulting in formation of epithelioid cell granulomas to follicular contents, such as keratin, sebum and Demodex folliculorum. Under the above assumptions, I would like to support the theory that lupus miliaris disseminatus faciei is not a tuberculid but a skin disorder similar to the papular type of acne rosacea.