I've used the regular and sensitive bandaids (& not just the bandaud brand) and had reactions to both and paper tape when using that to hold non stick dressings over the latest raw patch.

Thanks for that insight pholi it helps to understand a but but it's just so frustrating watching it. I think what ds currently is reacting to is more like a fungal infection as its not presenting like his usual appearance of eczema. Rolled up our carpet mat in the lounge tonight and swept the floorboards under that - hoping that helps too.
Seriously starting to think I need to find out about wet wrapping too.