My baby is 4 month old . He is having a big red mark on his hip it is like a rash . Please suggest something for him

A. Good morning, Your baby's diaper is a warm, moist area that naturally attracts yeast that can lead to infection. The fungus Candida albicans (the medical term for yeast) is a common culprit for causing diaper rash. Skin appears reddened with red dots or bumps at the edges. 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.