It may be deemed axiomatic that wherever tubercle bacilli find a resting place in an organism and there set up their characteristic histologic changes, if the focus be so localized that it may be removed entirely, by any agency whatever, this removal will constitute a cure of the disease.
On the recognition of this depends the value of any treatment for tuberculous lesions of the skin. Careful study of microscopic sections of infiltrative types of lupus immediately shows why many of the measures proposed for treatment have no value, except as mere palliatives for some of the annoying symptoms. I have too often seen the claim of a cure made when all that had been accomplished was the temporary healing of an ulcerating surface, the claimant being entirely unaware that a non-ulcerating patch of lupus is often more difficult to get rid of than one that has already broken down.
GOWAN GM. THE THERAPEUTICS OF TUBERCULOSIS OF THE SKIN.. JAMA. 1907;XLIX(9):737-744. doi:10.1001/jama.1907.25320090013001d