A blister-like lesion on the finger

Case #1

A 64-year-old woman presents with a lesion on her finger. She reports that it appeared 3 months earlier and is occasionally tender at times. At one point, she observed a thick mucus-like substance draining from the lesion. Physical examination reveals a translucent 6-mm nodule with surrounding erythema over the distal interphalangeal joint of the left fifth finger. In addition, ...