I found it in more areas tonight. I'm thinking it was a reaction to bleach residue in the tub from 2 days ago, but not sure why it would be spreading. I tried a new soap last night, but it was there before it. I went back to my old soap today.

Haven't changed any supplement or detergent or anything else.

Going to take Benadryl tonight. Will let you know how it goes.

Thanks for your thoughts everyone.