Tuberculous chancre
Definition:
A tuberculous chancre is the result of inoculation of M. tuberculosis into the skin of an individual without natural or artificial acquired immunity to the organism.
The bacillus enters the skin through abrasions and minor injuries, usually on the face or limbs and commonly in children.
►This is the least common type of tuberculous
lesion of the skin.
►It appears as a painless brown nodule which in
a week’s time breaks down to form an ulcer
with undermined edges.
►The entire lesion complex heals spontaneously
in most of the cases in a month’s time.
It starts as a brown
papule, which ulcerates
and persists as a sore.
The edge is undermined.
The chancre results
from direct inoculation.
Tuberculosis verrucosa cutis
alternative name: Warty Tuberculosis
ðThe characteristic lesion is a long standing verrucous, hyperkeratotic indurated plaque on the extremities, usually the lower limbs.
ðThe size of the lesion and the degree of hyperkeratosis usually varies with the duration of lesion.
ðFissuring and secondary infection of the hyperkeratotic surface may cause a purulent discharge and crusting.
The surface of the lesion soon shows a tendency to become knobby and furrowed, and the more prominent parts.. Assume at first a smooth warty and latter a papillomatous appearance.. The backs of the hands are the favorite sites of the melody, though it may occur on any parts of the body.
Lupus vulgaris:http://lupusvulgarisofskin.blogspot.com/
