PMC9639368_01
Lesions on scalp, before and after 8 weeks of azathioprine treatment.
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The lesions particularly demonstrated a characteristic border reminiscent of a snail-track appearance as illustrated in Figures 1-3.   
Genital vegetative plagues with yellowish pustules on surface before and after 8 weeks of azathioprine treatment.
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The lesions particularly demonstrated a characteristic border reminiscent of a snail-track appearance as illustrated in Figures 1-3.    Evidently, another well-defined and symmetric vegetative plaque with numerous yellowish pustules on its surface mostly affecting the labia majora was present as depicted in Figure 2.
Before and after images of vegetative plagues with surface erosions as well as characteristic snail-track border.
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The lesions particularly demonstrated a characteristic border reminiscent of a snail-track appearance as illustrated in Figures 1-3.   
Low power images (right) showing surface ulceration and superficial dermal infiltrate, and (left) high power image showing epidermal necrosis with predominantly dermal eosinophilic inflammatory infiltrate.
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See Figure 4.