Be sure your baby's skin is completely dry. Apply a thin coat of a healing ointment like Aquaphor or petroleum jelly, which will act as a barrier between your baby's skin and the drool. These ointments can be soothing to your baby's irritated skin. At bath time, be sure to use a mild, unscented baby wash
I use sudocrem. An antiseptic which helped my baby's rashes go away in just two days.