My dd has a rash under her mouth for the past year. Dr said acne and prescribed two weeks fucidin which is an antibiotic cream. Because the rash is under her mouth I think periodic dermatitis is more likely. Her rash is responding well to fucidin but she still has a small patch that is dry and flaky. Anyone has periodic dermatitis, please share your experience. What cream do you use and what do you do to prevent it from coming back. Thanks for your help.