A 54-year-old woman called her primary care provider to report a painful pink nodule on the left wrist 1 week after sustaining thorn injuries while weeding in her garden. Physical examination revealed 3 tender erythematous nodules in a linear distribution on the left arm with crusting at the incision and drainage site and painful left axillary lymphadenopathy.

A 64-year-old woman with a medical history of Waldenström macroglobulinemia, multiple sclerosis, and epilepsy presented with slowly growing papules on the plantar feet of 21 months' duration…