Erythematous skin lesions with necrotic centers on lower extremities due to the use of ruxolitinib for primary myelofibrosis.

Ruxolitinib is a small molecule JAK-2 inhibitor approved for the treatment of certain myeloproliferative neoplasms. Ruxolitinib-related skin toxicity is extremely rare. We report herein an unusual erythematous skin eruption with necrotic centers involving lower extremities in a patient with primary myelofibrosis treated with ruxolitinib. Awareness of this unusual skin toxicity with ruxolitinib becomes even more important as JAK-2 inhibition might soon find clinical applications in dermatology.