Been seeing this for almost a week now🥺

Help me!! I’m a first time mom !! I’m going to the pediatrician tomorrow cause idk what it is. I’ve tried the oatmeal lotion and wearing more bibs and making sure no milk gets in the neck rolls and being more consistent on cleaning his neck and idk I’ve tried aqua four and and extra virgin olive 😫🙏🏿 help me please it jus seems like more splotches are spearing it’s not bumpy like baby acne or even a rash I thought it was Eczema but I’m not sure cause it’s not dry but idk . Any other moms seen this or went through this or got Any ADVICE !?!