Skin smear is negative in which leprosy –
There should be no confusion at all; skin is not involved in pure neuritic leprosy, therefore skin smear will always (100%) be negative.
However, you should keep in mind very important fact that skin smear is also negative in most of the cases of Indeterminate and tuberculoid leprosy. But very rarely skin smear may be positive (as compared to neuritic type where skin smear is negative in 100% of cases).
Indeterminate
Neuritic
Lepromatous
Borderline