I'm posting for my sister-in-law again. Her 3 month old has been diagnosed with a yeast infection rash on her neck. Can this be spread to my sister-in-law's nipples and cause thrush? This might be a silly question, but I figured I'd ask! Any thoughts? She was given a prescription of nystatin powder for her daughter. Should she be concerned about spreading it and causing thrush, or am I over-reacting? Thanks for any help!