Upadacitinib in refractory cutaneous pseudolymphoma: A case report.

Cutaneous pseudolymphoma is a benign condition characterized by a reactive B-cell, T-cell or mixed lymphoproliferative process. Different causative agents (e.g. injected substances, tattoo, drugs and insect bites) have been described, but in many cases no cause can be identified; hence, the term idiopathic cutaneous pseudolymphoma. There are no specific guidelines for the treatment of cutaneous pseudolymphoma, and sometimes a few cases are refractory to conventional treatments. We describe a case of a 41-year-old African woman with refractory facial IgG4 pseudolymphoma successfully treated with upadacitinib.