PMC7225731_01
Cutaneous lesion in third finger of left hand, 1 week after initial injury (A) that progresses to ulceration over the next 3 weeks (B). Complete resolution of skin lesion with full functional after antituberculous treatment (C).
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One week after accident swelling and erythema developed in the site of puncture (Fig. 1A). A cutaneous skin ulcer was noted in his third finger of left hand with erythema of the ulcer margins and yellowish secretion (Fig. 1B) and limitation of affected finger mobility secondary to presence of the lesion.
(A) Chronic inflammation, with epithelioid granulomas with Langhan's giant cells (blue arrows) and foci of caseous necrosis (red arrow). H&E stain, 40x. (B) Acid-fast bacilli (small arrows). Ziehl-Neelsen stain, 40x.
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Histopathologic findings revealed an acute and chronic inflammation, with epithelioid granulomas, Langhan's giant cells and foci of caseous necrosis (Fig. 2A). Ziehl-Neelsen (ZN) stain detected the presence of acid-fast bacilli (Fig. 2B).