A healthy 37-year-old woman presented for evaluation of left upper eyelid blepharoptosis that had been slowly worsening for several years. The patient was otherwise asymptomatic, and a complete review of systems was negative. The results of her physical examination were notable for left-sided blepharoptosis with a palpable mass of the upper eyelid laterally. Eyelid eversion examination findings showed a yellow nodular lesion along the tarsal conjunctiva (Figure, A). An incisional biopsy was performed. Histopathologic examination results showed amorphous acellular proteinaceous deposits that positively stained with Congo red (Figure, B, inset). Polarized microscopy of the deposits showed apple-green birefringence (Figure, B).