The purpose of this study is to see if ruxolitinib, a Janus Kinase (JAK) 1/2 inhibitor, is safe for people who have acute skin graft versus host disease (GVHD) following allogenic hematopoietic stem cell transplantation (HSCT). This is a single arm, open-label pilot study. There is no randomization. This study will enroll approximately 10 patients with underlying malignancies with acute skin GVHD. Participants will be treated with topical ruxolitinib for 28 days or until the end of treatment if earlier resolution of GVHD is achieved.
