The Modified Severity Weighted Assessment Tool (mSWAT) (16), completed by the investigator, will be used to determine skin involvement at baseline and skin response to treatment beginning after administration of the 3 doses of brentuximab vedotin and low-dose TSEB. Skindex-16, a patient-completed form that measures symptoms and perceptions of toxicity in patients with skin disease will be used to assess skin-related QOL. Additionally, Form NTX will be completed by patients in Cohort A to assess symptoms of CIPN which is a side effect of brentuximab vedotin.