Fig 2.

Histopathological findings of the scalp punch biopsy. A, Deep perifollicular lymphohistiocytic infiltrate surrounding a pilosebaceous unit; hematoxylin and eosin (H&E), original magnification ×100. B, Striking outer root sheath epithelial apoptosis involving the pilosebaceous unit; note the absence of classic viral cytopathic changes such as ballooning degeneration or multinucleation; H&E, ×200. C, Periodic acid–Schiff (PAS) stain demonstrating subtle filamentous material within a hair shaft, initially interpreted as possible branching bacteria; PAS, ×200.