Hello, Can you upload a picture of rash? You can use paper-clip like icon for that.
Rash could be due to minor friction occurring while being held or edge of diaper. Scalp rash and drying could occur due to dandruff which is common in babies this age. You can use mild hydrocortisone cream if the scalp rash persists.
Does the back rash blanch when pressed?
Please avoid rubbing hard and soap over skin around rash. No need for any medication if it does not bother her.
Please consult pediatric dermatologist if rash persists beyond couple of weeks.