Shampoo gives me bumps on neck in back. Is that from fragrance?

Possibly. It could be from preservatives in the shampoo, the actual cleansing material in the shampoo, or the scent-related chemicals added to the shampoo. Best way to test is to switch to a hypoallergenic shampoo to see if rash improves. Can always restart the shampoo at a later time to see if the bumps return.