Background: The bacteriological and morphological status of leprosy patients is assessed by Slit Skin Smear (SSS) method. Bacteriological index (BI) is the semi quantitative index for measuring bacterial load and morphological index (MI) is for assessment of chemotherapeutic efficacy and bacterial resistance. Aims: To evaluate Bacteriological index and Morphological index on Slit Skin Smear in world health organization (WHO) recommended sites vs other reported hidden sites in untreated and relapsed cases of leprosy.