could Bibsters disposable bibs cause a rash??

Hi everyone, I have a question regarding the disposable bibs that bibsters makes. I just started using them a little while ago with my 15 month old. I was getting too lazy to clean the regular ones. They would just collect in the sink and it would take me forever to get to them. So I finally gave in and bought a bunch of disposables. All of a sudden, I think around the time I started to use them he got a rash around his neck. I wasnt sure if it was from something he ate maybe. However, the rash wouldn't go away. I asked the Dr. and he said it looks like just dry skin and advised to put lotion on it. So I did. Didn't work. I tired putting a little cortizon on it because it was red! Then it would fade then come back again. I finally realized today maybe its the bibs! thats the only new thing thats been touching his neck! has anybody else gone through that with these bibs? I tried researching online but there's nothing about it. I guess the onlyy way to find out is to take a break from using them. back to the old washing bibs by hand I guess!

Thanks in advance for any comments on this!