I am glad I found this site. Mid August, I presented with a dime sized welt on my thigh that I treated with fluocinonide almost to complete resolution. On September 28, 2024 a hivey looking rash started to appear on my arms and legs. I treated with two 5 day rounds of 50mg prednisone. I finally, reported this to my oncology team who referred me to a dermatologist who biopsied the rash yesterday. He suspects CAR T involvement. Will be very interested to see the results of the biopsy. Btw I received the Prevnar20 pneumococcal vaccine the day before the rash presented. The dermatologist suspects that this may have been a trigger but not a direct cause. I am now being treated with betaderm and UVB light therapy. Very interesting!