Help baby rash

Baby started having these red patches on one cheek for days now. I thought it was dry skin so I used vaseline and it's done nothing. The red patch is slowly spreading and she doesn't seem to be bothered by it. ughhh....I am also super upset that all 6 members of my husband's family kissed both my baby's cheeks. Now her other cheek is starting to have these red bumps. I am super annoyed. Like please wash your hands before touching a baby especially if baby has a rash. I emailed her doctor already to see what I can put on her cheeks because it's only getting worse. My baby is 3 months.