u/Andreslargo1

She says she saw it for a bit in her kitchen sink, now just in bathroom sink. Says it's not any products she is using, and it only appears after a few weeks.

I didn't do the plumbing, gonna try calling plumber tomorrow, but just wanted to see here if anyone has any possible suggestions for what it could be.. im stumped..

I checked toilet bowl and tank and didn't see any red. Shower i didn't see any red. Just this sink (and apparently for a bit in the kitchen sink)

It's a small house so that's about all the water using appliances (except dish washer and laundry, I'll have to ask if she's getting stains on clothes)

Thank you for any help you can provide