A case of a digitate injection site reaction from subcutaneous bortezomib in a patient with myeloma.

The proteasome inhibitor bortezomib is widely used in the treatment of multiple myeloma. While peripheral neuropathy and gastrointestinal effects are well-documented adverse reactions to bortezomib administration, cutaneous side effects in patients with multiple myeloma are less commonly reported. We present a patient with IgG kappa multiple myeloma who developed a spider-like and digitate eruption at the site of subcutaneous bortezomib injection. This report expands the spectrum of bortezomib-associated dermatologic toxicity and emphasizes the importance of clinician awareness for prompt diagnosis and management.