==leprosy==
*manifests in skin and peripheral nerves
*papule, macule, plaque, hypopigmentation, nodule
*loss of sensation, paralysis, amyotrophy
*incubation months to >30 years
===Ridley-Jopling classification===
*TT - tuberculoid
*BT - borderline tuberculoid
*BB - borderline borderline
*BL - borderline lepromatous
*LL - lepromatous
*TT direction - abnormal or significant immune response (granulomatous) against few ''M. leprae'' bacilli
**PB in WHO classification
**infiltrated plaque
**well-defined, sharp border
**single skin lesion
**localized, asymmetrical
**loss of sensation at skin lesion
***in histopathology nerves are surrounded by granuloma
*LL direction - least cellular immunity or allergic reaction against much amount of ''M. leprae'' bacilli
**MB in WHO classification
**macule, papule, nodule
**
==cutaneous TB==