baby acne came back?

Why would that happen? That hasn't been around since about her third week of life.
Is there anything I can do to help? (We don't breastfeed). It's little bumps that started on her forehead and now they're all over her cheeks and chin too. It's like she's breaking out but we haven't changed formula, medications, soaps, laundry soaps, anything??
Let me know if you may have any ideas??