PAPULAR lupoid rosacea, in certain cases, is most difficult to distinguish from the rosacea-like or micropapular tuberculid. Obviously the differentiation is an arbitrary, morphological one since there are no tests which infallibly settle the problem in questionable cases. In an attempt to evaluate the histological observations in rosacea and the micropapular tuberculid, Laymon and Michelson1 in 1940 performed biopsies on 30 patients with rosacea. After examination of sections from these patients they stated that there should be no confusion microscopically between true rosacea and the rosacea-like tuberculid and that in those sections in which giant cells were observed the cells were usually located about a degenerated follicle and true tubercle formation or even collections of epithelioid cells were absent. Continued observation over a period of 10 years, however, has altered these views. Patients have been seen whose eruptions were diagnosed rosacea-like tuberculid clinically in whom no histological evidence for
LAYMON CW, Dixon AA. LUPOID ROSACEA. AMA Arch Derm Syphilol. 1951;63(4):409–418. doi:10.1001/archderm.1951.01570040003001
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