ANY advice is appreciated

Nicole

Everytime my baby boy goes in the bath it flares up this rash, I put nothing in his bath (bubbles are baby shampoo, rash appears before I wash his hair) I’ve got prescribed cream because he gets little dry patches in the joints of his arm and on his knee but what else could cause this/ help him PLEASE any help

I’ve worked in nursery’s for the past 3 years so I’ve seen all types of rashes but this concerns me

Picture isn’t the clearest, sorry

*UPDATE* - ladies help this seems to be getting worse and GP is useless! It doesn’t bother him but it’s really concerning me