i'm so glad you posted this! My husband is 9 months post-CAR-T and he has a rash that started on his forehead two or three months ago. Just as you said, it is itchy at times. He saw our primary care doc, who prescribed a topical anti-inflammatory creme, which helped. (He was told to use it no longer than 2 weeks.) But now the rash is back and has spread around the side of his head and into his scalp. I'm glad it's not a constant annoyance, but it would be nice to understand it a bit better. Not that we're complaining! Given the choice between a harmless rash and deadly lymphoma, I think we'd take the rash every time!