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Primary Tuberculous Complex

Result of the inoculation of M. tuberculosis into the skin of an individual without natural or artificially acquired immunity to this organism. The bacillus enters the skin through minor injuries and unnoticed abrasions, usually on the face or limbs. The earliest lesion is a brownish-red papule. It develops into an indurated plaque that ulcerates. The resulting ulcer is characterized by an undermined edge and a haemorrhagic base. Prominent regional lymphadenopathy is often associated.

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