ICD-11 definition : Borderline leprosy is seen in patients with levels of cell-mediated immune response
to Mycobacterium leprae intermediate between those found in tuberculoid and lepromatous
leprosy. This designation may be used for those cases which have not been further
categorized as borderline tuberculoid or borderline lepromatous and for those categorized
as mid-borderline (BB) leprosy. Lesions typically consist of annular plaques with
an erythematous infiltrated rim and an almost normal looking centre. Borderline leprosy
is inherently unstable and may transform towards either polar end depending on the
individual's immune response to infection [Dermatology TAG].;
Borderline leprosy is seen in patients with levels of cell-mediated immune response
to Mycobacterium leprae intermediate between those found in tuberculoid and lepromatous
leprosy. This designation may be used for those cases which have not been further
categorized as borderline tuberculoid or borderline lepromatous and for those categorized
as mid-borderline (BB) leprosy. Lesions typically consist of annular plaques with
an erythematous infiltrated rim and an almost normal looking centre. Borderline leprosy
is inherently unstable and may transform towards either polar end depending on the
individual's immune response to infection [Dermatology TAG].