dealing with rash from Padcev

My chemo ( Keytruda/Padcev ) has been postponed twice due to a rash covering 80% of my body. High dose steroids after first round gave some relief, but rash never went away completely, and came back after second round of chemo so I only did the 1st of the 21 day dose. Day 8 Padcev only was cancelled. On steroids again. Feel like crap. Anyone else experience this?