In discussing any cutaneous disorder attributed to the tubercle bacillus one enters a field full of controversy.
There are, unquestionably, certain dermatologic conditions which have a tuberculous etiology, yet there are many others grouped under the heading of tuberculids as to the proper classification of which there may be reasonable doubt.
Therefore, in this article my aim is to keep to the generally accepted ideas pertaining to the subject.
Darier1 makes the following statement:
There are but two characters of absolute scientific value permitting the assertion that a cutaneous lesion is tuberculous—they are:
(1) The presence of the bacillus of Koch in the lesion;
(2) The positive result of inoculation of the diseased tissue into animals, particularly the guinea-pig.
One may supplement this statement by adding a third criterion, i.e., the recovery of tubercle bacilli in culture mediums inoculated with material from the questionable lesion.
In addition to
GORDON WH. UNUSUAL CASE OF CUTANEOUS TUBERCULOSIS. Arch Derm Syphilol. 1937;35(6):1110–1115. doi:https://doi.org/10.1001/archderm.1937.01470240102009
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